change word in string javascript code example

Example 1: javascript replace string

var str = "JavaScript replace method test";
var res = str.replace("test", "success");  
//res = Javscript replace method success

Example 2: replace all javascript

str.split(search).join(replacement);

Example 3: change word in string javascript

let str = "Hello World!";
let res = str.replace("World", "Birds");