Clean Code in JavaScript

Detecting strings

Detecting strings is pleasantly simple. The typeof operator is all we need:

typeof 'hello'; // => "string"

In order to check for the length of a given String, we can simply use the length property:

'hello'.length; // => 5

If we need to check whether a String has a length greater than 0, we can either explicitly do so via length or rely on the falsiness of a 0 length, or even rely on the falsiness of the empty string itself:

const string = '';Boolean(string);            // => falseBoolean(string.length);     // => falseBoolean(string.length > 0); // => false// Since an empty String is falsy we can just check `string` directly:if (string) { }// Or we can be more explicit:if (string.length) { }// Or we can be maximally explicit:if (string.length ...