In some languages like C# we have the possiblity of returning values from a switch statement or in functional like Scala we have pattern matching that is even better, making it more readable in case our goal is to return a value (even after some computation).

Javascript does not have such a function, natively.

Not a life changer, but I think it would be cool to be able to do something like

const result = switch(key) { case 'foo': 4 ...

A cool usage is in React when you're in need of a switch inside your JSX code.

Let's recap the advantages of such a thing:

• No need to reassign a variable
• Can use immutability with a const - safer code
• Can be easily used in JSX
• Can support validation in case there are duplicated cases
• No longer have bugs because you forgot to reassign, return or add break at the end

Mostly for fun, I created a little library to do so, you can already find it on https://www.npmjs.com/package/iswitch

Just run npm install iswitch in your project and you're good to go!

Some examples:

const myKey = 'foo';

// Single case
const result = iswitch(myKey, ['foo', () => 1], ['bar', () => 8]); // 1

// Multiple case
const result = iswitch(myKey, [['foo', 'bar'], () => 1]); // 1

// Default
const result = iswitch(myKey, [['bar'], () => 1], [[], () => 5]); // 5

What do you think? Will you stick to the usual switch or will you give this a try? Let me know!