javascript get first word in string

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

var val = 'asdasd:111122:123123123';
var response = val.substring(val.indexOf(":"));

alert(response); // ":111122:123123123"

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

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

var str = "Java Script Object Notation";
var matches = str.match(/\b(\w)/g); // ['J','S','O','N']
var acronym = matches.join(''); // JSON

console.log(acronym)

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

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