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zwitch
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zwitch

index.js
license
package.json
readme.md

readme.md

zwitch

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Handle values based on a property.

Install

[npm][]:

sh
npm install zwitch

Use

js
var zwitch = require('zwitch')

var handle = zwitch('type')

handle.invalid = invalid
handle.unknown = unknown
handle.handlers.alpha = handle

handle({type: 'alpha'})

Or, with a switch statement:

javascript
function handle(value) {
  var fn

  if (!value || typeof value !== 'object' || !('type' in value)) {
    fn = invalid
  } else {
    switch (value.type) {
      case 'alpha':
        fn = handle
        break
      default:
        fn = unknown
        break
    }
  }

  return fn.apply(this, arguments)
}

handle({type: 'alpha'})

API

`zwitch(key[, options])`

Create a functional switch, based on a key (string).

`options`

Options can be omitted and added later to one.

handlers (Object.<Function>, optional) — Object mapping values to handle, stored on one.handlers
invalid (Function, optional) — Handle values without key, stored on one.invalid
unknown (Function, optional) — Handle values with an unhandled key, stored on one.unknown

Returns

Function — See [one][one].

`one(value[, rest...])`

Handle one value. Based on the bound key, a respective handler will be invoked. If value is not an object, or doesn’t have a key property, the special “invalid” handler will be invoked. If value has an unknown key, the special “unknown” handler will be invoked.

All arguments, and the context object, are passed through to the [handler][], and it’s result is returned.