String cheat sheet

var greet = "Hello, ";
var place = "World"

All strings have at their disposal several built-in properties, but there’s a single property that is really useful: the length property, which is used like this:

greet.length; // 7

To read each individual character at a specific index in a string, starting from zero, I can use the charAt() method:

greet.charAt(0); // 'H'

The concat() method joins two strings:

"Wo".concat("rl").concat("d"); // 'World'

The indexOf returns the location of the first position that matches a character:

"ho-ho-ho".indexOf('h'); // 0
"ho-ho-ho".indexOf('o'); // 1
"ho-ho-ho".indexOf('-'); // 2

The lastIndexOf finds the last match, otherwise it works the same as indexOf.

The split method chops up the string into an array of sub-strings:

"ho-ho-ho".split("-"); // ['ho', 'ho', 'ho']

There are also some methods to change the casing of strings. For example:

greet.toUpperCase(); // "HELLO, "
greet.toLowerCase(); // "hello, "

Here’s a list of all the methods covered in this cheat sheet:

• charAt() 
• concat()
• indexOf()
• lastIndexOf()
• split()
• toUpperCase()
• toLowerCase()