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zwitch

Handle values based on a property

  • 2.0.4
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What is zwitch?

The zwitch npm package is a utility for handling polymorphic dispatch based on a property value. It allows you to define a default handler and specific handlers for different values of a given property. This can be particularly useful for tasks like routing, handling different types of data structures, or implementing pattern matching in your code.

What are zwitch's main functionalities?

Handling different types of messages

This feature demonstrates how zwitch can be used to handle different types of messages based on their 'type' property. It shows setting up handlers for specific types and handling invalid or unknown types.

{"const zwitch = require('zwitch');\nconst handle = zwitch('type');\n\nhandle.invalid = (value) => { console.error('Invalid type:', value); };\nhandle.unknown = (value) => { console.error('Unknown type:', value); };\nhandle.handlers.string = (value) => { console.log('String:', value); };\nhandle.handlers.number = (value) => { console.log('Number:', value); };\n\nhandle({type: 'string', value: 'Hello, world!'});\nhandle({type: 'number', value: 42});\nhandle({type: 'boolean', value: true});"}

Default and specific handling

This feature illustrates using zwitch to define a default handler and a specific handler for the 'foo' key. It demonstrates how unhandled keys are processed by the default handler.

{"const zwitch = require('zwitch');\nconst handle = zwitch('key');\n\nhandle.default = (value) => { console.log('Default handler:', value); };\nhandle.handlers.foo = (value) => { console.log('Handled foo:', value); };\n\nhandle({key: 'foo', value: 'bar'});\nhandle({key: 'baz', value: 'qux'});"}

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Package last updated on 16 Nov 2022

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