how does split work on strings in js code example

Example 1: javascript slice string from character

var input = 'john smith~123 Street~Apt 4~New York~NY~12345';

var fields = input.split('~');

var name = fields[0];
var street = fields[1];

Example 2: js split string

var myString = "Hello World!";

// splitWords is an array
// [Hello,World!]
var splitWords = myString.split(" ");

// e.g. you can use it as an index or remove a specific word:
var hello = splitWords[splitWords.indexOf("Hello")];