javascript - 为什么javascript中的对象没有find方法？

Question

我启动了 node repl 并输入了此内容

> function isPrime(element, index, array) {
...   var start = 2;
...   while (start <= Math.sqrt(element)) {
.....     if (element % start++ < 1) {
.......       return false;
.......     }
.....   }
...   return element > 1;
... }
undefined
> [4, 6, 8, 12].find(isPrime)
TypeError: Object 4,6,8,12 has no method 'find'
    at repl:1:16
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.EventEmitter.emit (events.js:98:17)
    at emitKey (readline.js:1095:12)

这里出了什么问题？为什么数组对象没有 find 方法？不是和here一样吗？

Answer 1

V8 目前没有实现 .find() 数组方法(参见 source )。所以 node.js 和 io.js 不支持它。请参阅compatibility table