tagged-switch

Library to experiment using template literals for creating a switch/case expression returning the respective value.

Installation

npm install --save tagged-switch
yarn add tagged-switch

Usage

The library can be used to create case-matching statements which return their respective values:

import taggedSwitch from 'tagged-switch';

const currencySymbolToName = taggedSwitch`
  ${'€'} -> ${'Euro'}
  ${'$'} -> ${'Dollar'}
  ${'£'} -> ${'Pound'}
  _ -> ${'Unknown'}
`;

console.log(currencySymbolToName('€')); // Euro

The following checks will be performed and will throw an error in the case that one check fails:

• There must be at least one specific case and one default case.
• The cases must use a ->-string to separate the key of the case from its value.
• The default value must be the last one, declared by a _-string followed by the ->-string.
• Keys can only occur once.

TODO

• useful tests
• support of ES5

License

Licensed under GNU General Public License v3.0. See LICENSE.