why we use split() in js code example

Example 1: string split javascript

var myString = "An,array,in,a,string,separated,by,a,comma";
var myArray = myString.split(",");
/* 
*
*  myArray :
*  ['An', 'array', 'in', 'a', 'string', 'separated', 'by', 'a', 'comma']
*
*/

Example 2: split javascript

var str = "12,15,16,78,59";
var res = str.split(",");
console.log(res[0]); // result: 12
console.log(res[2]); // result: 16

Example 3: split array javascript

// Returns new array from exising one
arr.slice(start, end);