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.

Answer 1

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));