javascript get first 10 characters of string

let str = 'John Wick'
let firstChar = str.charAt(0) 
console.log(firstChar); // "J" 

var str = "HELLO WORLD";

var res = str.charAt(0); 

var str="Hello Folks!"
var firstStringChar = str.charAt(0); //H

var x = 'some string';
alert(x.charAt(0)); // alerts 's'

var str = "Hello world That is reallly neat!";
var res = str.substring(0, 5);//get first 5 chars

const string = "0123456789";
console.log(string.slice(0, 2)); // "01"
console.log(string.slice(0, 8)); // "01234567"
console.log(string.slice(3, 7)); // "3456"

 var str = "Hello world!";
var res = str.substring(0, 1);
 

var myString = "Hello Operator";
var firstWord = myString.substr(0, codeLine.indexOf(" "));

console.log(firstWord);
---------------------------------------------------------------
 > Hello