Function to provide a similar syntax to a switch statement but with regex as cases.


switcher provides a similar syntax to a switch statement in JavaScript but with RegExp as cases.

I tried to mimic the syntax of a switch statement as good as possible. The following example shows how to match against the UserAgent string to detect iOS devices.

switcher(navigator.userAgent, {
    '/i(OS|Pad|Phone|Pod)/'function (scopeexpression) {
        console.log('iOS device. '+scope+' did match '+expression);
    ''function () {
        console.log('any device.');

Note that the Regular Expressions are written as Strings as JavaScript doesn't allow RegExp objects as keys. The default case is represented by an empty string as this one matches everything. You should always put the default case at last as with breakMode set to true no cases after the default one could be reached.

switcher(scope, tests, options);

Options can be changed by passing an object as third parameter to switcher.

When set to true (which is default) switcher will stop testing after the first match. When set to false switcher will continue testing (but note that changes that may have been made by previous matches can be overwritten ‒ especially if you have a default case at the end).

MIT license