why object in javascript does not have find method?

Question

I started node repl and typed this in

> 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)

What is wrong here? Why would an array object does not have the find method? Isn't it the same as here?

Well I thought so but now somebody says I'm wrong :( It may not be supported yet. — Pointy
– Pointy, Commented Jan 29, 2015 at 5:06

alexpods · Accepted Answer · 2015-01-29 05:18:49Z

1

V8 did not realize .find() array method for now (see source). So node.js and io.js do not support it. See compatibility table

edited Jan 29, 2015 at 5:18

answered Jan 29, 2015 at 5:02

alexpods

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3 Comments

Pointy Over a year ago

It does if you invoke it with --harmony

alexpods Over a year ago

@Pointy no, try it youself. I think v8 does not support find() for now, but can be wrong at this point.

Pointy Over a year ago

Oh. Weird. It supports lots of other ES6 stuff; .find() certainly doesn't seem exotic.

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