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| // cache any function call, use the args as a key | |
| const memoize = (fn) => { | |
| let cache = {}; | |
| return (...args) => { | |
| if (cache[args]) { | |
| return cache[args]; | |
| } else { | |
| let result = fn.apply(this, args); | |
| cache[args] = result; | |
| return result; | |
| } | |
| } | |
| } | |
| // const fastFn = memoize(slowFn); |
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