13.deepClone

[mewcoder]

实现深拷贝

[mewcoder]

function deepClone(source, map = new WeakMap()) {

    if (source === null || typeof source !== "object") return source // 基本类型返回
    if (map.get(source)) return map.get(source);

    const target = Array.isArray(source) ? [] : {}

    map.set(source, target);

    for (let key in source) {
        if (source.hasOwnProperty(key)) {
            target[key] = deepClone(source[key], map);
        }
    }
    return target;
}