Is-subset-of NPM

is-subset-of

is-subset-of verifies whether an array or an object is a subset.

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Installation

$ npm install is-subset-of

Quick Start

First you need to add a reference to is-subset-of to your application:

const { isSubsetOf } = require('is-subset-of');

If you use TypeScript, use the following code instead:

import { isSubsetOf } from 'is-subset-of';

Then you can verify if an array or an object is a subset of another array or object by calling the isSubsetOf function and handing over the arrays or objects:

console.log(isSubsetOf(
  [ 2, 3, 5 ],
  [ 2, 3, 5, 7, 11 ]
));
// => true

console.log(isSubsetOf(
  { name: 'the native web' },
  { name: 'the native web', city: 'Riegel am Kaiserstuhl' },
));
// => true

Verifying subsets structurally

From time to time, you are only interested if one object is a structural subset of another object, i.e. if its keys are contained within the other one, but you want to ignore the values. For that, use the isSubsetOf.structural function:

console.log(isSubsetOf.structural(
  { name: 'Node.js' },
  { name: 'the native web', city: 'Riegel am Kaiserstuhl' }
));
// => true

console.log(isSubsetOf.structural(
  { firstName: 'Golo', lastName: 'Roden' },
  { name: 'the native web' }
));
// => false