day01_手写Lodash中的memoize记忆函数

手写Lodash中的memoize记忆函数

// 求圆的面积
function getArea(r) {
    console.log('执行了getArea');
    return Math.PI * r * r
}
// 记忆函数
function memoize(fn) {
    let cache = {}
    return function () {
        let key = JSON.stringify(arguments)
        cache[key] = cache[key] || fn.apply(fn, arguments)
        return cache[key]
    }
}

const getAreaUseMemoize = memoize(getArea)

const r1 = getAreaUseMemoize(15)
const r2 = getAreaUseMemoize(15)
const r3 = getAreaUseMemoize(15)

console.log(r1);
console.log(r2);
console.log(r3);
// 执行了getArea
// 706.8583470577034
// 706.8583470577034
// 706.8583470577034

标签：console,Lodash,getArea,day01,cache,getAreaUseMemoize,key,memoize,log
来源： https://www.cnblogs.com/lv77/p/16110542.html