Best of Modern JavaScript — Function Parameters

Best of Modern JavaScript — Function Parameters

Since 2015, JavaScript has improved immensely. It’s much more pleasant to use it now than ever. In this article, we’ll look at the core features of JavaScript.

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at the core features of JavaScript.

Parameter Default Values

With ES6, we can add default values to function parameters.

This is great since we won’t have to worry about parameters being undefined again.

The old way would be to use the || operator to return a default value and assign it to the parameter:

function foo(x, y) {
  x = x || 0;
  y = y || 0;
}

With default parameters, we can write:

function foo(x = 0, y = 0) {
  //···
}

It’s much shorter and cleaner.

And default parameter values are only assigned when the parameter value is undefined .

Whereas with the || operator, any falsy value would return the default value, which we may not want.

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