maybee
v0.1.4
Published
Safe chaining of object properties and functions using ES2015 Proxy.
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MayBee
Safe chaining of object properties and functions using ES2015 Proxy.
- npm:
npm install maybee --save
Getting Started
Note: Requires Proxy support.
import {safeguard, isUndefined, isNull} from 'maybee';
const person = safeguard({ name: 'Adam', age: null });
console.log(person.name); // Adam
console.log(isNull(person.age)) // true
console.log(isUndefined(person.getNames().firstName)) // true
console.log(isUndefined(person.with.a.long.non.existent.property)) // true
See unit tests for further examples — however considering a primitive isn't returned, then you can continue chaining as required — this is in anticipation of an eventual value, and therefore primitives are returned when they exist.
Undefined!
Once MayBee
finds a primitive value in your object, then all of the Proxy
witchery is stopped from there on in.
For example, given the person
above, we can extend infinitely on unknown properties/functions, but as soon as a primitive has been reached, then normal JavaScript rules are abided by:
// √
console.log(person.with.an.unknown().property.and.a().function.or.two);
// TypeError: person.name.on is undefined √
console.log(person.name.on.a.known().property);
This behaviour makes it easier to stick closely with the JavaScript spec — otherwise MayBee
would have to introduce a non-standard function for when you wanted the value rather than another Proxy
— such as getValue()
— ugh!
Example
Try out the interactive console example on Heroku!