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Various object utility functions





Build Status Test Coverage Dependabot Status Dependencies NPM Downloads Semantic-Release Gardener

Getting Started

$ npm install --save-dev object-lib


For more extensive examples, please refer to the tests.

align(obj: Object, ref: Object)

Align the ordering of one object recursively to a reference object.


const { align } = require('object-lib');

const obj = { k1: 1, k2: 2 };
const ref = { k2: null, k1: null };

align(obj, ref);
// obj => { k2: 1, k1: 2 }

clone(obj: Object[], needles: Array = [])

Deep clone object.

Fields targeted by passed needles are created as a reference and not cloned.

Fields targeted by excluded needles are removed entirely from the result.

Needles are declared using the object-scan syntax.


const { clone } = require('object-lib');

const data = { a: {}, b: {}, c: {} };
const cloned = clone(data, ['b', '!c']);

// => { a: {}, b: {} }
console.log(cloned.a !== data.a);
// => true
console.log(cloned.b === data.b);
// => true

contains(tree: Object, subtree: Object)

Check if subtree is contained in tree recursively.

Different types are never considered contained.

Arrays are contained iff they are the same length and every element is contained in the corresponding element.

Objects are contained if the keys are a subset, and the respective values are contained.

All other types are contained if they match exactly (===).


const { contains } = require('object-lib');

contains({ a: [1, 2], b: 'c' }, { a: [1, 2] });
// => true

contains({ a: [1, 2], b: 'c' }, { a: [1] });
// => false

Merge(logic: Object = {})(...obj: Object[])

Allows merging of objects. The logic defines paths that map to a field, or a function, to merge by.

If a function is passed, it is invoked with the value, and the result is used as the merge identifier.

The paths are defined using object-scan syntax.


const { Merge } = require('object-lib');

  { children: [{ id: 1 }, { id: 2 }] },
  { children: [{ id: 2 }, { id: 3 }] }
// => { children: [ { id: 1 }, { id: 2 }, { id: 2 }, { id: 3 } ] }

Merge({ '**[*]': 'id' })(
  { children: [{ id: 1 }, { id: 2 }] },
  { children: [{ id: 2 }, { id: 3 }] }
// => { children: [ { id: 1 }, { id: 2 }, { id: 3 } ] }