is-subset

Check if an object is contained within another one.

Installation

$ npm install is-subset

Usage

1. Import the module:

import isSubset from 'is-subset/module';

// …or:
var isSubset = require('is-subset');

2. These are true:

isSubset(
  {a: 1, b: 2},
  {a: 1}
);

isSubset(
  {a: 1, b: {c: 3, d: 4}, e: 5},
  {a: 1, b: {c: 3}}
);

isSubset(
  {a: 1, bcd: [1, 2, 3]},
  {a: 1, bcd: [1, 2]}
);

…and these are false:

isSubset(
  {a: 1},
  {a: 2}
);

isSubset(
  {a: 1},
  {a: 1, b: 2}
);

isSubset(
  {a: 1, bcd: [1, 2, 3]},
  {a: 1, bcd: [1, 3]}
);

See the specs for more info.

API

isSubset(superset, subset)

Check if an object is contained within another object.

Returns true if:

• all enumerable keys of subset are also enumerable in superset, and
• every value assigned to an enumerable key of subset strictly equals the value assigned to the same key of superset – or is a subset of it.

Parameters:

• Object superset
• Object subset

Return value:

• Boolean

License

MIT © Studio B12 GmbH