get part of string in javascript code example

Example 1: get part of string javascript

var str="123 - aaaaa"
var num = str.slice(0,3) //num="123"
var name= str.slice(6) //name="aaaaa"

Example 2: cut string from string javascript

var ret = "data-123".replace('data-','');
console.log(ret);   //prints: 123

Example 3: reactjs cut part of string

var str = "Hello world!";

var res = str.substring(1, 4);

// res value is "ell"