This is a simplified version of Node.js util.format(). This supports only %s placeholder, but faster than that. This will be the best solution if you need speed rather than complex formatting.

Same as Node.js util.format().

format(formatString[, ...])

var s = format('%s, %s!', 'Hello', 'world');
console.log(s);     // => 'Hello, world!'

var i, len, s = Date.now();
for (i = 0, len = 10000000; i < len; i++) {
    format('i = %s, len = %s', i, len);
}
console.log(Date.now() - s);

environment1: MacBook Air Early 2015 + Node.js v0.12.5

environment2: Core i7 2.5GHz Windows 8.1 Pro + Internet Explorer 11

sprintf-js is a JavaScript sprintf implementation for the browser and Node.js. It is slow but might not be inevitable because a high functional module.

npm install fast-format --save

bower install fast-format

Chrome, Firefox, Safari, Opera, and Internet Explorer 6+

MIT