Why (thisIsInTheArray in array) returns false?

Question

var codeList = [ "ok", "error" ]
var msg = { "status": "ok" }
console.log(msg.status in codeList) // returns false

It seems to be working on my iPad but not my computer. Here's a screenshot on my Chrome 64.0.3282.119, Windows 10 x64, JavaScript V8 6.4.388.40:

[The `in` operator does not do what you think it does.](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in) — Pointy, Jan 27 '18 at 15:03
@Pointy So i can use `{ ok: "", error: "" }` and then use `in`? — imgg, Jan 27 '18 at 15:10
The `in` operator tests if an object has a property defined. For example, `"0" in codeList` would be `true`. — 4castle, Jan 27 '18 at 15:11

Xopoc · Accepted Answer · 2018-01-27T15:41:33.230

2

According to documentation:

The in operator returns true if the specified property is in the specified object or its prototype chain.

PS: There are a lot of interesting stuff in MDN documentation ;)

edited Jan 27 '18 at 15:41

answered Jan 27 '18 at 15:14

Xopoc

1

As I understand the question he just need to check if status is one of the allowed statuses, so `codeList.includes(msg.status)` should do the work – Xopoc Jan 27 '18 at 15:21

1 Answers1