Concat string typescript

var str1 = new String( "This is string one" ); 
var str2 = new String( "This is string two" ); 
var str3 = str1.concat(str2.toString());
console.log("str1 + str2 : "+str3)   
// str1 + str2 : This is string oneThis is string two

Source: tutorialspoint.com

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