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| var arr = [
{ name: 'zs', age: 1 },
{ name: 'l4', age: 2 },
{ name: 'w5', age: 3 },
{ name: 'ss', age: 4 },
]
var obj = {
name: 'thisArg',
age: 2222
}
function deepClone(origin, hashMap = new WeakMap()) {
if (origin == undefined || typeof origin !== 'object') {
return origin
}
if (origin instanceof Date) {
return new Date(origin)
}
if (origin instanceof RegExp) {
return new RegExp(origin)
}
const hashKey = hashMap.get(origin);
if (hashKey) {
return hashKey;
}
const target = new origin.constructor()
hashMap.set(origin, target)
for (let k in origin) {
if (origin.hasOwnProperty(k)) {
target[k] = deepClone(origin[k], hashMap)
}
}
return target
}
Array.prototype.myReduceRight = function (cb, initValue) {
var _arr = this;
var _len = _arr.length;
var _arg3 = arguments[2] || window;
var _item;
for (let i = _len - 1; i >= 0; i--) {
_item = deepClone(_arr[i])
initValue = cb.apply(_arg3, [initValue, _item, i, _arr])
}
return initValue;
}
var flag = arr.myReduceRight(function (prev, item, index, arr) {
if (item.age > 2) {
console.log(prev, item, this);
prev += item.age
}
return prev
}, 0, obj)
console.log(flag)
|
