@fnando/check

check

An alternative for switch that resembles Ruby's case.

Install

If you're using yarn:

yarn add @fnando/check

If you're using npm:

npm install @fnando/check

Usage

The following example shows all supported type checkings:

import check from "@fnando/check";

// `input` can be either a value or a function.
// When providing a function, the function is called only once
// before running `case`s.
const input = 1;

check(input)
  .case(1, () => console.log("Received one!"))
  .case(/^hello$/, () => console.log("Hello!"))
  .case("Hi", () => console.log("Hi!"))
  .case(undefined, () => console.log("input is undefined"))
  .case(null, () => console.log("input is null"))
  .case([true, false], () => console.log("boolean received"))
  .test(() => console.log("This is the default statement"));

Both case and default functions receive the input value.

check(1)
  .case(1, number => console.log(`Received ${number}`))
  .test();

check(1)
  .test(number => console.log(`Received ${number}`));

License

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.