Better JavaScript — Primitives

Better JavaScript — Primitives

Like any kind of apps, JavaScript apps also have to be written well. Otherwise, we run into all kinds of issues later on. In this article, we’ll look at ways to improve our JavaScript code.

Like any kind of apps, JavaScript apps also have to be written well.

Otherwise, we run into all kinds of issues later on.

In this article, we’ll look at ways to improve our JavaScript code.

Converting Objects to Primitives

Objects can be converted to numbers with the valueOf method.

For instance, we can write:

const obj = {
  valueOf() {
    return 3;
  }
};
console.log(2 + obj);

then we see 5 logged.

We can so convert an object to a string with:

const obj = {
  toString() {
    return 'bar';
  }
};
console.log('foo' + obj);

Then we get:

'foobar'

logged.

If an object has both the valueOf and toString methods, then it’s not obvious which one will be run.

So if we have:

const obj = {
  toString() {
    return "[object obj]";
  },
  valueOf() {
    return 'bar';
  }
};
console.log('foo' + obj);

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