How can I do string interpolation in JavaScript?

Question

Consider this code:

var age = 3;

console.log(\"I\'m \" + age + \" years old!\");

Are there any other ways to insert the value of a variabl

Answer 1

Expanding on Greg Kindel's second answer, you can write a function to eliminate some of the boilerplate:

var fmt = {
    join: function() {
        return Array.prototype.slice.call(arguments).join(' ');
    },
    log: function() {
        console.log(this.join(...arguments));
    }
}

Usage:

var age = 7;
var years = 5;
var sentence = fmt.join('I am now', age, 'years old!');
fmt.log('In', years, 'years I will be', age + years, 'years old!');