javascript functions in objects

Question

I was trying to "put a function into an object" so I wanted to do something like this but I'm getting errors everywhere.

var someobject = {
    makename(1)  : null,
    makename(2)  : null,
    makename(3)  : null,
    makename(4)  : null
};

function makename(num) {
    return (identifier + ' Bot' + num)
}

actually, I think in es6 there are computed keys or something of that sort — AmmarCSE, Dec 22 '15 at 21:03
They can if you use bracket notation instead, that's the only way to get dynamic keys — adeneo, Dec 22 '15 at 21:03

score 3 · Answer 1 · answered Dec 22 '15 at 21:03

3

var someobject = {}

someObject[makename(1)] = null;
someObject[makename(2)] = null;
someObject[makename(3)] = null;
someObject[makename(4)] = null;

This works everywhere. However, @pointy's solution is nicer!

answered Dec 22 '15 at 21:03

lex82

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score 3 · Accepted Answer · answered Dec 22 '15 at 21:05

3

In modern (ES2015) JavaScript environments, you can do this:

var someobject = {
  [makename(1)]: "foo",
  [makename(2)]: "bar"
};

The [ ] wrapper around the property name allows it to be an arbitrary expression. The result of evaluating the expression is interpreted as a string and used as the property name.

answered Dec 22 '15 at 21:05

Pointy

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:-), thats what I was looking for! – AmmarCSE Dec 22 '15 at 21:06

javascript functions in objects

2 Answers2