example of memoization in javascript

memo.js

////////////////////////////////////
// Example of Memoization by Alex Merced of AlexMercedCoder.com
///////////////////////////////////


const addNums = (x,y) => x + y

const createMemo = (thefunc) => {
    const cache = {}

    return (...args) => {
        console.time("memo")
        const argstring = args.toString()

        if(cache[argstring]){
            console.log("use cache")
            console.timeEnd("memo")
            return cache[argstring]
        } else {
            console.log("use function")
            cache[argstring] = thefunc(...args)
            console.timeEnd("memo")
            return cache[argstring]
        }

        
    }
}

const memoAddNums = createMemo(addNums)

console.log(memoAddNums(1,1))
console.log(memoAddNums(1,1))
console.log(memoAddNums(1,1))

console.log(memoAddNums(1,2))
console.log(memoAddNums(1,2))
console.log(memoAddNums(1,2))