Strict-field NPM

An utility to strict the query to an object.

Installation

Node

$ yarn add strict-field

Browser

<script src="https://unpkg.com/strict-field@1.1.0/dist/strict-field.min.js"></script>

Usage

const strictField = require('strict-field');

const ACTION = strictField(['MOVE', 'TALK', 'WALK']);

console.log(ACTION('MOVE')); // -> MOVE
console.log(ACTION('TALK')); // -> TALK

console.log(ACTION('SOMETHING')); // call console.error;

you can use Object as parameter if you want to differentiate between keys and value

const strictField = require('strict-field');

const ACTION = strictField({
  MOVE: 'person_move',
  TALK: 'person_talk',
  WALK: 'person_walk'
});

console.log(ACTION('MOVE')); // -> person_move 
console.log(ACTION('TALK')); // -> person_talk 

console.log(ACTION('SOMETHING')); // call console.error;

Why?

Sometimes, you need to make constants to be grouped in an Object (e.g., DAYS, MONTHS), especially if you are storing your bunch of constants in a single dedicated constants file. If you are doing this, there will be cases where you are accindentally accessing undefined value (DAYS.MNDAY).

It will be problematic if you need to pass your constants into a function that doesn't complaint about undefined value. But, in the case above, the undefined is not what you want to pass to the function. The undefined is caused by the typo.

Actually, we have Proxy in Web API that can handle this problem. But Proxy is not supported in some browsers, especially IE. And according to Babel docs, some features cannot be transpilled or polyfilled due to the ES5 limitations.

Because we have to support all browsers (at least their latest version), this little simple utility is created.