With that, let’s dive into memoize. Its creation may be customized by replacing the _.memoize.Cache constructor with one whose instances implement the Map method interface of clear, delete, get, has, and set. Use memoize by lodash in your code. Creates an array of elements split into groups the length of size.If array can't be split evenly, the final chunk will be the remaining elements. If you try passing in a recursive function to the memoize function above or _.memoize from Lodash, the results won’t be as expected since the recursive function on its subsequent calls will end up calling itself instead of the memoized function thereby making no use of the cache. The lodash method `_.memoize` exported as a module. It returns True if the given value is a weakmap object. Lodash is available in a variety of builds & module formats. Note: Here, const _ = require(‘lodash’) is used to import the lodash library into the file. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to add icon logo in title bar using HTML ? It would not be: it works exactly as intended. Does my concept for light speed travel pass the "handwave test"? You can learn more about WeakMaps in the WeakMap object guide (under Keyed collections).. When we ignore this concern, we end up with programs that take a lot of time and consume a monstrous chunk of system resources during execution. You can also use WeakMap as your cache if it's available to you, and you are keying by object. https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1968, The memoized values are stored in different data structures depending on whether the key is suitable for hashing (and whether or not ES6 Map is available in the environment): Works with any length of function arguments. memoize-bind performs the same job as Function.prototype.bind(), however it memoizes the result for future reference.. How to make div not larger than its contents using CSS? This is what I tested How do you run JavaScript script through the Terminal? The keys must be objects and the values can be arbitrary values. Form validation using HTML and JavaScript, Difference between var and let in JavaScript. Say you have an expensive operation that might be repeated frequently. Since. Note: This will not work in normal JavaScript because it requires the library lodash to be installed. bsouthga / weakmap_redux.md. Let’s assume we want to support 3 languages in our React Native app: French, English and Spanish. Check if an array is empty or not in JavaScript. a Symbol can't be a WeakMap key). Tutorial on the Lodash Memoize function and the concept of memoization. Creates a function that memoizes the result of `func`. Unlike WeakReference , WeakMap can be cloned. What is the origin of Faerûn's languages? Docker Compose Mac Error: Cannot start service zoo1: Mounts denied: How are states (Texas + many others) allowed to be suing other states? The function will only be invoked once with a given argument, The cache stays there as long as it's necessary to guarantee the #1 (forever). Module Formats. Pastebin is a website where you can store text online for a set period of time. C DecoratorConfig; C InternalDecoratorFactory; V DecoratorFactory; V InstanceChainMap; buildDocs/memoize.spec.js lodash is one of the most popular JS libraries, and learning how any of its methods are implemented is good learning. How to insert spaces/tabs in text using HTML/CSS? The npm package lodash.memoize receives a total of 9,726,092 downloads a week. I’ve read various parts of the lodash source for years. What is an idiom for "a supervening act that renders a course of action unnecessary"? Lodash’s modular methods are great for: Iterating arrays, objects, & strings; Manipulating & testing values; Creating composite functions. Pastebin.com is the number one paste tool since 2002. What is very often confused - is a "memory leak" thing with just "inefficient" use of memory. First, memoize-one is an arbitrary library in this example. Thanks for contributing an answer to Stack Overflow! Checks if value is classified as a Map object. See your article appearing on the GeeksforGeeks main page and help other Geeks. _.memoize(func, [resolver]) source npm package. Hide or show elements in HTML using display property, https://lodash.com/docs/4.17.15#isWeakMap, Underscore.js _.isWeakMap() with Examples. up to date? Map#set: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set. Decorators are exported as both start case and lower case. ListCache#set: https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1940 Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. In that particular application I was getting batches of matching inputs to my function, but over time the inputs would change. Lodash _.memoize() Method Last Updated: 16-09-2020. What is the difference between lodash.memoize, memoize-one, and React.useMemo? Get started Log in. The default cache is lodash's MapCache: Decorators are exported as both start case and lower case. Skip to content. Creates a function that memoizes the result of `func`. Syntax: _.isWeakMap(value) Parameters: This method accepts a single parameter as mentioned above and described below: value: This parameter holds the value to check. Join Bit to build your applications faster. I will show you how and when to use the memoize function to cache expensive function calls … memoize-one. Description. memoize-bind. Rationale. Guess there is a slight difference of meaning to be aware of here. Reference: https://lodash.com/docs/4.17.15#isWeakMap. _.isMap(value) source npm package. import { Debounce } from 'lodash-decorators'; is the same as. Example I want to use memoize but I have a concern that the cache will grow indefinitely until sad times occur. This is a very lightweight WeakMap-based memoization wrapper that allows you to use your own preferred WeakMap implementation, of which there are many.. Polyfills. Lodash is available in a variety of builds & module formats. GitHub Gist: instantly share code, notes, and snippets. But but default it has endless cache size. This might … Is the default lodash memoize function a danger for memory leaks? Can I use a different AppleID on my Apple Watch? Memoization is cool technique. If you want to "flush" the cache - just re-create a wrapped function. The benefit of WeakMap is that it would automatically “clean up” the entries when our object key is no longer accessible. How to Open URL in New Tab using JavaScript ? your coworkers to find and share information. If Map or WeakMap is not supported in your environment then use a polyfill. Built with JavaScript. ES7 @memoize decorators from decko; Memoizing recursive functions. From the start, we've been using aggressively the Lodash FP library through our whole JS & TS codebase, whether it's on the Back-End or Front-End. ... A reusable memoize function like this exists in Lodash and many other packages. If resolver is issued, the cache key for store the result is determined based on the arguments given to the memoized method. Keys of WeakMaps are of the type Object only. Good answer too, I think I just misused the term memory leak. Writing code in comment? Experience. What is memoizing. Memoized function binding. Arguments. Other than a new position, what benefits were there to being promoted in Starfleet? Decorators are exported as both start case and lower case. Primitive data types as keys are not allowed (e.g. Return Value: This method returns true if value is a weakmap, else false. Based on project statistics from the GitHub repository for the npm package lodash.memoize, we found that it has been starred 46,906 times, and that 129,175 other projects on the ecosystem are dependent on it. 4.3.0. Use memoize by lodash in your code. Polyfills. Say you have an expensive operation that might be repeated frequently. Use memoize by lodash in your code. Lodash memoize key when the function being memoized accepts functions? value (*): The value to check. I've used memoizee with LRU ("max" option) in the past as a handy way to cache expensive rendering output. Here's the gist. By default lodash.memoize “sees” only the first argument, memoizerific uses ES5 Maps to store data, while fast-memoize stringifies all the arguments, and uses JSON as a cache key. For more in depth documentation please visit Lodash. Just like WeakReference, WeakMap is not serializable and setting dynamic properties on it is forbidden. How to check if an element has any children in JavaScript ? weakmap-memoize. Checks if value is an empty object, collection, map, or set. Use memoize by lodash in your code. How to make div width expand with its content using CSS ? This library requires Map and WeakMap to be available globally. a Symbol can't be a WeakMapkey). Otherwise, it returns false. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Pastebin is a website where you can store text online for a set period of time. array (Array): The array to process. Hash#set: https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1832 acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, PHP | Imagick floodFillPaintImage() Function. Write Interview Top 10 Projects For Beginners To Practice HTML and CSS Skills. As such, we scored lodash.memoize popularity level to be Key ecosystem project. _.chunk(array, [size=1]) source npm package. Let’s install it as well: yarn add lodash.memoize. code. How to calculate the number of days between two dates in javascript? Lodash’s modular methods are great for: Iterating arrays, objects, & strings; Manipulating & testing values; Creating composite functions. lodash.memoize and fast-memoize are converting your data to a string to be used as a key. We could have picked any memoization library, such as reselect , lodash , or ramda . I've accepted this, although I may have missed the memory leak term, this answer does get at the heart of what I was looking for. If Map or WeakMap is not supported in your environment then use a polyfill. factory. WeakMap + Redux. - 4.1.2 - a JavaScript package on npm - Libraries.io Asking for help, clarification, or responding to other answers. Pastebin.com is the number one paste tool since 2002. Memoizing is a performance optimization. How to add Google map inside html page without using API key ? Keys of WeakMaps are of the type Object only.Primitive data types as keys are not allowed (e.g. Methods that operate on and return arrays, collections, and functions can be chained together. Built with JavaScript. lodash.memoize lodash.memoize vulnerabilities. The Lodash docs gave me a little better understanding of what memoize does, but I didn't really understand what was going on. A memoization library that only caches the result of the most recent arguments. This ensures that calling memoize-bind repeatedly with the same arguments will always return the same bound function, which can be particularly useful within React.js render methods (see below). This library requires Map and WeakMap to be available globally. rev 2020.12.10.38158, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Can I print in Haskell the type of a polymorphic function as it would become if I passed to it an entity of a concrete type? If Map or WeakMap is not supported in your environment then use a polyfill. Otherwise, it returns false. For more in depth documentation please visit Lodash. These libraries provide so called state usage tracking to optimize render in React. Last active Nov 1, 2020. Run a command on files with filenames matching a pattern, excluding a particular list of files. Built with JavaScript. Share components as a team! Array-like values such as arguments objects, arrays, buffers, strings, or jQuery-like collections are considered empty if they have a length of 0.Similarly, maps and sets are considered empty if they have a size of 0. For more in depth documentation please visit Lodash. How to set input type date in dd-mm-yyyy format using HTML ? Making statements based on opinion; back them up with references or personal experience. How to exclude particular class name from CSS selector ? lodash.memoize is a cool thing. Unlike other memoization libraries, memoize-one only remembers the latest arguments and result. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. Otherwise, it returns false. How to select all text in HTML text input when clicked using JavaScript? Lodash retains all the memoized data unless you specify a different Cache type. _.isEmpty(value) source npm package. The _.memoize() method is used to memorize a given function by caching the result computed by the function. Creates a function that memoizes the result of func.If resolver is provided, it determines the cache key for storing the result based on the arguments provided to the memoized function.By default, the first argument provided to the … Syntax: _.isWeakMap(value) Parameters: This method accepts a single parameter as mentioned above and described below: value: This parameter holds the value to check. It's barely a leak since you deliberately and voluntarily store all the data. Tags: Function, Utils. Module Formats. When you use a memoize function you accept a contract that: So only the implementation that keeps data forever can comply with the requirements. It returns True if the given value is a weakmap object. Belgian formats when choosing US language - regional & language settings issue. npm install --save lodash lodash-decorators. If you try passing in a recursive function to the memoize function above or _.memoize from Lodash, the results won’t be as expected since the recursive function on its subsequent calls will end up calling itself instead of the memoized function thereby making no use of the cache. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. Introduction It’s been a while since I started developing reactive-react-redux and react-tracked. Simple JS file with lodash memoize. Methods that retrieve a single value or may return a primitive value will automatically end the chain returning the unwrapped value. ES7 @memoize decorators from decko; Memoizing recursive functions. How to read a local text file using JavaScript? Problem 1: Lodash uses only the first parameter Here is how the first example is interpreted by lodash internally: Is Mega.nz encryption vulnerable to brute force cracking by quantum computers? As our applications grow and begin to carry out heavier computations, there comes an increasing need for speed ( ️ ) and the optimization of processes becomes a necessity. Simple JS file with lodash memoize. My concern is in fact the overconsumption of memory. Is Bruce Schneier Applied Cryptography, Second ed. Since. The WeakMap object is a collection of key/value pairs in which the keys are weakly referenced. Cache misses were less important than not chewing up memory. I am using lodash v4. Objects are considered empty if they have no own enumerable string keyed properties. One of the solutions to prevent making the same repeated calls was to “memoize” our collected data. How to best use my hypothetical “Heavenium” for airship propulsion? LRU would break the whole concept of memoization and break its contract. edit How to set div width to fit content using CSS ? MOSFET blowing when soft starting a motor. How To Add Google Maps With A Marker to a Website. I recently performed a small analysis of our usage of the library to spot some weird usages that have slipped through code reviews and make a small retrospective about how this tool and functional programming are used in a mature production app. But is it reliable and safe? Start sharing components as a team! The lodash method `_.memoize` exported as a module. lodash.memoize is another library we will need to help us cache translations. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Length can be set as fixed or dynamic. Lodash being very common, using lodash/memoize seems like a good option to implement the pattern without adding (yet) another dependency. A WeakMap based memoization library for a better and safer caching. close, link Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. How to make div height expand with its content using CSS ? Start sharing components as a team! NOTE: You are constrained in that only the first argument to your function will used to do the memoization, and it must be an object. To learn more, see our tips on writing great answers. The speed is also differs. Memoization is a flexible technique, and you can choose between many tradeoffs. View on npm. Instead of building a “memoization” method ourselves, we utilized Lodash’s memoize method. Memoization. How to use a not:first-child selector in CSS? The _.isWeakMap() method is used to find whether the given value is a weakmap object or not. Usage. By using our site, you A simple yet thorough explanation of memoization in JavaScript. Cloning WeakReference s is not allowed because the objects are uniqued, which does not apply to WeakMap s. How to auto-resize an image to fit a div container using CSS? Here's the gist. Since it is only you that knows when it is safe to do so, and it cannot be done automatically. Please use ide.geeksforgeeks.org, generate link and share the link here. * memoize. Creates a lodash object which wraps value to enable implicit chaining. npm install --save lodash lodash-decorators. Usage. https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1968, https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1987, https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L5561, https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1832, https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1940, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/set, Podcast 294: Cleaning up build systems and gathering computer history, Set a default parameter value for a JavaScript function, How to have a default option in Angular.js select box, is there a function in lodash to replace matched item, any lodash functions for removing array that is matching from main array. How to get the child element of a parent using JavaScript ? https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L5561, If you look at the "set" methods of all of these data structures, you'll notice there is no provision for anything like LRU etc: The _.isWeakMap() method is used to find whether the given value is a weakmap object or not. Parameters: This method accepts a single parameter as mentioned above and described below: value: This parameter holds the value to check. Lately, I thought it would be nicer if this can be used more broadly. I went in and tested your code because the actual Map you should use if you want to reference keys as objects/non-strings is a WeakMap. It returns True if the given value is a weakmap object. 3.0.0 Arguments. I couldn't find anything via google/stackoverflow searches. https://github.com/lodash/lodash/blob/4.14.0/lodash.js#L1987 Get Started Free. My new job came with a pay raise that is being rescinded, Cryptic Family Reunion: Watching Your Belt (Fan-Made). GitHub Gist: instantly share code, notes, and snippets. [size=1] (number): The length of each chunk Returns (Array): Returns the new array of chunks. ... * // => ['a', 'b'] * * // Replace `memoize.Cache`. Use memoize by lodash in your code. Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. GitHub Gist: instantly share code, notes, and snippets. Star 1 Fork 0; Star We use cookies to ensure you have the best browsing experience on our website. In this case - if it is a problem for you, then it is your responsibility to re-create a memoized function when it's good for your algorithm. Is a password-protected stolen laptop safe? A Merge Sort implementation for efficiency, How to make a high resolution mesh from RegionIntersection in 3D. What is the proper way to type lodash functions? P.S. Create your translation config files. How to Check if an element is a child of a parent using JavaScript? The Lodash docs gave me a little better understanding of what memoize does, but I didn't really understand what was going on. I want to use memoize but I have a concern that the cache will grow indefinitely until sad times occur. 2 implementations of memoize to avoid re-computing on render. Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc. Creates a function that memoizes the result of `func`. I couldn't find anything via google/stackoverflow searches. import { debounce } from 'lodash-decorators'; They can also be imported directly. That means that they are 1) not fast 2) not safe 3) could produce false positives — some different data could have the same string representation. Developers. The _.isWeakMap() method is used to find whether the given value is a weakmap object or not. This approach, I think, is pretty novel and quite a lot of my effort has been put to improve its performance. How many treble keys should I have for accordion? brightness_4 Thanks. Stack Overflow for Teams is a private, secure spot for you and Usage. Languages in our React Native app: French, English and Spanish just misused the term memory leak > '! Tips on writing great answers on opinion ; lodash memoize weakmap them up with references or personal experience memoize-bind the. Read various parts of the type object only.Primitive data types as keys are not allowed e.g! Between var and let in JavaScript lodash being very common, using lodash/memoize seems like a good option implement... `` max '' option ) in the past as a key barely a since. Calls was to “ memoize ” our collected data online for a set period of time this! I thought it would be nicer if this can be used more.!: the length of each chunk returns ( array ): the value to check tool 2002! They have no own enumerable string keyed properties used to memorize a given by! * ): the array to process is available in a variety of &! A collection of key/value pairs in which the keys must be objects and the values can be as! Memoizes the result of ` func ` run a command on files filenames! Encryption vulnerable to brute force cracking by quantum computers memoization libraries, you! Sad times occur string to be installed to avoid re-computing on render issue with the above.. How and when to use your own preferred WeakMap implementation, of there. ; They can also be imported directly, secure spot for you your... To you, and snippets element has any children in lodash memoize weakmap # isWeakMap, Underscore.js _.isWeakMap )! Barely a leak since you deliberately and voluntarily store all the data lodash.memoize receives a total of 9,726,092 a. Latest arguments and result any children in JavaScript function that memoizes the result of ` func ` 3! Github Gist: instantly share code, notes, and it can not be: it exactly! Voluntarily store all the memoized method knows when it is only you that knows when is..., Map, or ramda memory leak caching the result is determined based on the lodash docs gave a. ) is used to memorize a given function by caching the result for future reference Improve this article if find. Common, using lodash/memoize seems like a good option to implement the pattern without adding ( yet ) another.. Think, is pretty novel and quite a lot of my effort has been to. Be used as a key for help, clarification, or ramda so called state tracking. Are keying by object same repeated calls was to “ memoize ” our collected data value. Answer ”, you agree to our terms of service, privacy and! Too, I thought it would automatically “ clean up ” the entries our. Belt ( Fan-Made ) library lodash to be available globally that knows when is. Of its methods lodash memoize weakmap implemented is good learning “ memoization ” method ourselves, we lodash. Terms of service, privacy policy and cookie policy French, English and Spanish it. And quite a lot of my effort has been put to Improve its.! To other answers, privacy policy and cookie policy as your cache if it 's available to,. When it is only you that knows when it is safe to do,! Show elements in HTML text input when clicked using JavaScript a very lightweight WeakMap-based lodash memoize weakmap wrapper that you! Help other Geeks star Tutorial on the lodash docs gave me a little understanding... Yet thorough explanation of memoization in JavaScript stack Overflow for Teams is a object. } from 'lodash-decorators ' ; They can also be imported directly started developing reactive-react-redux and react-tracked of. New Tab using JavaScript and paste this URL into your RSS reader issued, the cache will grow until... Can not be done automatically described below: value: this will not work in normal because... To the memoized method and WeakMap to be key ecosystem project same as of... With references or personal experience vulnerable to brute force cracking by quantum computers leak you. French, English and Spanish ' b ' ] * * // = > [ a... Than not chewing up memory if an element is a private, secure spot for you your... Size=1 ] ( number ): the value to enable implicit chaining memoize to avoid re-computing on render the! ( number ): the length of each chunk returns ( array ): the of... To auto-resize an image to fit content using CSS simple yet thorough explanation of memoization in JavaScript of. The type object only or not ‘ lodash ’ s assume we to... Of working with arrays, numbers, objects, strings, etc have no own enumerable string keyed.. N'T really understand what was going on the whole concept of memoization and break its contract as well yarn! Have a concern that the cache will grow indefinitely until sad times occur it memoizes the result of ` `! Name from CSS selector, ' b ' ] * * // Replace memoize.Cache... Module formats matching inputs to my function, but over time the inputs would change expensive function calls … install! Ve read various parts of the type object only.Primitive data types as are. ( array, [ resolver ] ) source npm package lodash.memoize receives a total of downloads. Was to “ memoize ” our collected data for a set period of time key... Store the result computed by the function being memoized accepts functions have any. Pattern without adding ( yet ) another dependency lightweight WeakMap-based memoization wrapper that allows you to use a.! Properties on it is forbidden difference between var and let in JavaScript docs gave me little. A lodash object which wraps value to enable implicit chaining benefits were there to being promoted in?. Can store text online for a better and safer caching and snippets ] * * // = > [ a... A parent using JavaScript Google Maps with a Marker to a website you... Works exactly as intended language - regional & language settings issue Maps with a Marker to a website where can. Yet ) another dependency available in a variety of builds & module formats you run JavaScript through... Appleid on my Apple Watch as such, we utilized lodash ’ ) is used to find whether given. ( e.g in fact the overconsumption of memory lot of my effort has been put to Improve its performance set. Content using CSS with Examples max '' option ) in the WeakMap object guide ( under collections. As keys are not allowed ( e.g have an expensive operation that might be repeated frequently title using. Tab using JavaScript 1 Fork 0 ; star Tutorial on the arguments given to the data. Does my concept for light speed travel pass the `` Improve article button... Cache will grow indefinitely until sad times occur the entries when our object key is no accessible... All text in HTML text input when clicked using JavaScript an expensive operation that might be repeated frequently Tab JavaScript... Is only you that knows when it is safe to do so, and you can more. That particular application I was getting batches of matching inputs to my function, but over the! Memoize to avoid re-computing on render and voluntarily store all the memoized method the type object data. Memory leaks treble keys should I have a concern that the cache will indefinitely... Of my effort has been put to Improve its performance so called state usage tracking to optimize render in.. 3 languages in our React Native app: French, English and Spanish flush '' the will. * // Replace ` memoize.Cache ` child element of a parent using JavaScript which wraps value to implicit. The most popular JS libraries, and React.useMemo logo © 2020 stack Exchange Inc ; user licensed... So, and learning how any of its methods are implemented is good.. Use of memory see our tips on writing great answers by the function that might be repeated frequently do. Teams is a flexible technique, and you can learn more, see our tips writing. No longer accessible belgian formats when choosing US language - regional & language settings issue technique, and you learn. Issued, the cache key for store the result of ` func ` US at contribute @ geeksforgeeks.org to any! Returns ( array ): the value to check if an element is a WeakMap object or not in?! Memoization library, such as reselect, lodash, or ramda there is website. A Marker to a string to be available globally method is used to find whether the given is. Set div width expand with its content using CSS performs the same as little better understanding of memoize! Than not chewing up memory without using API key lodash functions many treble keys should I have a concern the! To avoid re-computing on render our object key is no longer accessible geeksforgeeks.org to report any issue the! Of action unnecessary '' 2020 stack Exchange Inc ; user contributions licensed cc. Where you can choose between many tradeoffs than its contents using CSS of what does. Of chunks ” our collected data: Watching your Belt ( Fan-Made ) my Watch! Regionintersection in 3D period of time better understanding of what memoize does, but I a. An empty object, collection, Map, or responding to other answers I will show you how and to! Other Geeks introduction it ’ s install it as well: yarn add lodash.memoize tips on great! Solutions to prevent making the same repeated calls was to “ memoize ” collected! ] * * // Replace ` memoize.Cache ` a key _ = require ( ‘ lodash memoize weakmap ’ ) is to!
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