Object-Oriented JavaScript - Second Edition

Strings

A string is a sequence of characters used to represent text. In JavaScript, any value placed between single or double quotes is considered a string. This means that 1 is a number, but "1" is a string. When used with strings, typeof returns the string "string":

> var s = "some characters";
> typeof s;
"string"
> var s = 'some characters and numbers 123 5.87';
> typeof s;
"string"

Here's an example of a number used in the string context:

> var s = '1';
> typeof s;
"string"

If you put nothing in quotes, it's still a string (an empty string):

> var s = ""; typeof s;
"string"

As you already know, when you use the plus sign with two numbers, this is the arithmetic addition operation. However, if you use the plus sign with strings, this is a string ...