better-switch

A simple alternative to the switch statement for matching strings and returning values

To use

import { betterSwitch } from 'https://deno.land/x/better_switch@v1.0.15/mod.ts'

Examples

Enforcing a consistent return type using type inference from the first return value:

const returnVal = betterSwitch('test', { 
  test: () => 'test value', 
  default: () => 'default value' 
}) // returnVal === 'test value'

Enforcing a specified consistent return type:

const returnVal = betterSwitch<string>('test', { 
  test: () => 'test value', 
  default: () => 'default value' 
}) // returnVal === 'test value'

Typescript error because the default key does not return the same type as the first key:

const returnVal = betterSwitch('test', { 
  test: () => 'test value', 
  default: () => true 
})

Allowing unknown return types:

const returnVal = betterSwitch<unknown>('non existent key', {
  test: () => 'test value', 
  default: () => true 
}) // returnVal === true

Allowing multiple specified return types

const returnVal = betterSwitch<string | boolean>('non existent key', { 
  test: () => 'test value', 
  default: () => true 
}) // returnVal === true