How to interpolate variables in strings in JavaScript, without concatenation?

Question

I know in PHP we can do something like this:

$hello = \"foo\";
$my_string = \"I pity the $hello\";

Output: \"I pity the foo\"<

Answer 1

Complete answer, ready to be used:

 var Strings = {
        create : (function() {
                var regexp = /{([^{]+)}/g;

                return function(str, o) {
                     return str.replace(regexp, function(ignore, key){
                           return (key = o[key]) == null ? '' : key;
                     });
                }
        })()
};

Call as

Strings.create("My firstname is {first}, my last name is {last}", {first:'Neo', last:'Andersson'});

To attach it to String.prototype:

String.prototype.create = function(o) {
           return Strings.create(this, o);
}

Then use as :

"My firstname is ${first}".create({first:'Neo'});