A simple javascript utility for conditionally joining classNames together.
Install with npm, or download the UMD version (provides window.classnames, or defines the AMD modules 'classnames').
npm install classnamesThe classNames function takes any number of arguments which can be a string or object.
The argument 'foo' is short for {foo: true}. If the value of the key is falsy, it won't be included in the output.
classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', {bar: true}); // => 'foo bar'
classNames({foo: true}, {bar: true}); // => 'foo bar'
classNames({foo: true, bar: true}); // => 'foo bar'
// lots of arguments of various types
classNames('foo', {bar: true, duck: false}, 'baz', {quux: true}) // => 'foo bar baz quux'
// other falsy values are just ignored
classNames(null, false, 'bar', undefined, 0, 1, {baz: null}, ''); // => 'bar 1'
// if you have an array of these, use apply
var array = ['foo', {bar: true}];
classNames.apply(null, array); // => 'foo bar'