Arrow function in object definition

Question

In Javascript Harmony, we can for example do the following:

var maths = {
   sum (...args) {
      let r = 0;
      for (let num of args) {
         r += num;
      }
      return r;
   }
};
maths.sqr = n => n * n;

I just wondered if there is any way to use an arrow function, like sqr within the object definition, just like sum.

Yes you can do, But the this value will differ, It will not point to the maths object. — Rajaprabhu Aravindasamy
– Rajaprabhu Aravindasamy, Commented Nov 10, 2016 at 12:53

Nina Scholz · Accepted Answer · 2016-11-10 13:04:17Z

3

You could just write it as literal.

var maths = {
        sqr: n => n * n,
        sum (...args) {
            let r = 0;
            for (let num of args) {
                r += num;
            }
            return r;
        }
    };

console.log(maths.sqr(5));
console.log(maths.sum(2, 4, 5));

edited Nov 10, 2016 at 13:04

answered Nov 10, 2016 at 12:59

Nina Scholz

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2 Comments

Liglo App Over a year ago

My sum is not wrong, it just uses another syntax. I wondered if we can use the same syntax without :, but apparently not, as your example shows.

Nina Scholz Over a year ago

i have never seen this.

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