js left string code example

Example 1: substring javascript

var str = "Hello world!";
var res = str.substring(1, 4); //ell

Example 2: substring

const str = 'Mozilla';

console.log(str.substring(1, 3));
// expected output: "oz"

console.log(str.substring(2));
// expected output: "zilla"

Example 3: javascript select letter in string

const str = 'Hello';
str.substring(0, 2); // => 'Hel'