Javascript: Object method vs Object.prototype method

Question

I'm studying the difference between Object.method and Object.prototype.method. I know I should use Object.keys() as following.

    var arr = new Array(1,2,3);
    console.log(Object.keys(arr)); //["0", "1", "2"]

and Object.prototype.toString() as following

var arr = new Array(1,2,3);
arr.toString(); // "1,2,3"
console.log(arr.keys(arr));

I get

Array Iterator {}

at a console. Why? Shouldn't it be denied in the first place? (Since .keys() method is in Object object itself not in Object.prototype that maybe means arr cannot approach to the .keys() method?) What am I missing?

Jonas Wilms · Accepted Answer · 2019-03-31 11:25:40Z

6

You actually found another method, namely Array.prototype.keys()

answered Mar 31, 2019 at 11:25

Jonas Wilms

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