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import { isArraysEqual } from './array'
export function memoize<T>(workerFunc: T): T {
let args
let res
return function() {
if (!args || !isArraysEqual(args, arguments)) {
args = arguments
res = (workerFunc as any).apply(this, arguments)
}
return res
} as any
}
/*
always executes the workerFunc, but if the result is equal to the previous result,
return the previous result instead.
*/
export function memoizeOutput<T>(workerFunc: T, equalityFunc: (output0, output1) => boolean): T {
let cachedRes = null
return function() {
let newRes = (workerFunc as any).apply(this, arguments)
if (cachedRes === null || !(cachedRes === newRes || equalityFunc(cachedRes, newRes))) {
cachedRes = newRes
}
return cachedRes
} as any
}