String Manipulation

.toUpperCase();

var sentence = "Example of a string."
var upperCase = sentence.toUpperCase();  // EXAMPLE OF A STRING.

.toLowerCase();

var sentence = "ExaMPle of a StriNg."
var lowerCase = sentence.toLowerCase(); // example of a string.

.split();

var sentence = "Example of a string."
var words = sentence.split(" "); // ["Example", "of", "a", "string."]

--> Needs a space (" ") in order for it to work. Because it shows you where the string should split up, in this case after the space. (This could be a comma, ...)

.slice();

var sentence = "Example of a string."
var word = sentence.slice(3, 8); // mple

.indexOf();

var sentence = "Example of a string."
var position = sentence.indexOf("string"); // 13

charAt() ;

Returning letter in string

var sentence = "Example of a string."
var position = sentence.charAt(4); // p