javascript String Concatenation

concat() method joins strings:
var s1 = "endmemo.com";
var s2 = "javascript";
var s3 = "tutorial";
var s = s1.concat(" ", s2, " ", s3);
//s is now "endmemo.com javascript tutorial"

Or, simplely use "+" operator:
var s1 = "endmemo.com";
var s2 = "javascript";
var s3 = "tutorial";
var s = s1 + " " + s2 + " " + s3; //same result

Or, use "+=" operator:
var s = "endmemo.com";
var s2 = "javascript";
s += " " + s2; //s = "endmemo.com javascript"
var s3 = "tutorial";
s += " " +s3; //s="endmemo.com javascript tutorial"

Another way to join an array of strings:
var arr = ["endmemo","js", "string"];
var s = arr.join(" "); //s = "endmemo js string"

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