how to work split in JS code example

Example 1: js string to array

var myString = 'no,u';
var MyArray = myString.split(',');//splits the text up in chunks

Example 2: in javascript how to split string

var str = 'It iS a 5r&e@@t Day.'
var array = str.split(" ");
print(array);

var str = 'It iS a 5r&e@@t Day.'
var array = str.split(" ",2);
print(array);

Example 3: split() javascript

let countWords = function(sentence){
    return sentence.split(' ').length;
}

console.log(countWords('Type any sentence here'));

//result will be '4'(for words in the sentence)