knowledgecode/format.js

a format function like String#format() in Java

Format.js

Format.js is a simple JavaScript format function, like a Java String.format.
It works in Chrome, Firefox, Safari, Opera, and IE 6.0+.

Usage

String

%s

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

%8s (Left padding)

var s = format('%8s world.', 'Hello');
console.log(s);     // '   Hello world.'

%-8s (Right padding)

var s = format('%-8s world.', 'Hello');
console.log(s);     // 'Hello    world.'

Number

%d

var s = format('%d billion people.', 7.062);
console.log(s);     // '7.062 billion people.'

%5d (Left padding)

var s = format('%5d billion people.', 7);
console.log(s);     // '    7 billion people.'

%-5d (Right padding)

var s = format('%-5d billion people.', 7);
console.log(s);     // '7     billion people.'

%03d (Zero padding)

var s = format('%03d billion people.', 7);
console.log(s);     // '007 billion people.'

%o (Octal notation)

var s = format('0%o', 100);
console.log(s);     // '0144'

%x (Hex notation)

var s = format('0x%x', 255);
console.log(s);     // '0xff'

Escape

%%d

var s = format('%%d to %d', 100);
console.log(s);     // '%d to 100'

License

Format.js is available under the terms of the MIT license.