join in typescript code example

Example: array.join typescript

var arr = new Array("First","Second","Third"); 
          
var str = arr.join(); 
console.log("str : " + str );  
          
var str = arr.join(", "); 
console.log("str : " + str );  
          
var str = arr.join(" + "); 
console.log("str : " + str );