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var foo = {}
Object.defineProperty(foo, 'name', {
configurable: true, //是否可以delete foo.delete
enumerable: true, // 是否for in可以返回属性
writable:true, //是否可以重新赋值
value: 'kobe'
var descriptor = Object.getOwnPropertyDescriptor(foo, 'name')
console.log( // kobe

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Yang03 commented Oct 10, 2017

function sum(list) {
  if (list.length === 0) {
    return 0;
  } else {
    const [atom, ...remainder] = list;
    const left = atom;
    const right = sum(remainder);

    return left + right;

sum([42, 3, -1])

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