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Merge pull request #57 from enbyautumn/main
Add MEMOIZE function to automatically memoize a function
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| //=========// | ||
| // Memoize // | ||
| //=========// | ||
| { | ||
| // Memoize the function - Modified from https://tjinlag.medium.com/memoize-javascript-function-638f3b7c80e9 | ||
| // keymaker is optional and allows you to specifiy a method for generating the key for the cache | ||
| // It should be used if the default method is not suitable for the use case | ||
| // The memo function returns a new function that will now be memoized, meaning it caches results | ||
| Habitat.memo = (fn, keyMaker) => { | ||
| // Make a Map (similar to an object but with faster lookup) to store the results of the function | ||
| const cache = new Map() | ||
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| return (...args) => { | ||
| // Make a key that will be used to look up the results of the function | ||
| // This keyMaker is not very efficent, but should work for more use cases | ||
| // A better keyMaker would be one that is specific to the use case, such as (a) => args[0] | ||
| const key = keyMaker ? keyMaker.apply(this, args) : args.map(JSON.stringify).join('') | ||
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| // If the key is in the cache, return the value | ||
| if (cache.has(key)) { | ||
| return cache.get(key) | ||
| } | ||
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| // If the key is not in the cache, run the function and store the result in the cache | ||
| const result = fn.apply(this, args) | ||
| cache.set(key, result) | ||
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| return result | ||
| } | ||
| } | ||
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| Habitat.memo.install = (global) => { | ||
| global.memo = Habitat.memo | ||
| Habitat.memo.installed = true | ||
| } | ||
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| } |
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