filter-obj

What is filter-obj?

The filter-obj npm package allows users to filter the properties of an object based on specific criteria. This can be useful for creating subsets of an object, removing unwanted properties, or selectively copying properties based on dynamic conditions.

What are filter-obj's main functionalities?

Filtering based on property names

This feature allows you to filter an object by specifying which property names to keep. It is useful for extracting specific properties from an object.

const filterObj = require('filter-obj');
const obj = { a: 1, b: '2', c: 3 };
const filtered = filterObj(obj, ['a', 'c']);
console.log(filtered); // Output: { a: 1, c: 3 }

Filtering using a function

This feature enables filtering based on a function that takes key and value as arguments. It allows for more dynamic and condition-based filtering, such as filtering out properties based on their types or values.

const filterObj = require('filter-obj');
const obj = { a: 1, b: '2', c: 3 };
const filtered = filterObj(obj, (key, value) => typeof value === 'number');
console.log(filtered); // Output: { a: 1, c: 3 }

Other packages similar to filter-obj

lodash.pick

lodash.pick is a method from the Lodash library that creates an object composed of the picked object properties. It is similar to filter-obj but is part of a larger utility library, which might be preferable for users who need other utility functions.

object-filter

object-filter is another npm package that provides similar functionality to filter-obj, allowing filtering of object properties based on a predicate function. It compares to filter-obj in terms of functionality but might have different implementation details or additional options.

README

filter-obj

Filter object keys and values into a new object

Install

npm install filter-obj

Usage

import {includeKeys, excludeKeys} from 'filter-obj';

const object = {
	foo: true,
	bar: false
};

const newObject = includeKeys(object, (key, value) => value === true);
//=> {foo: true}

const newObject2 = includeKeys(object, ['bar']);
//=> {bar: false}

const newObject = excludeKeys(object, (key, value) => value === true);
//=> {bar: false}

const newObject3 = excludeKeys(object, ['bar']);
//=> {foo: true}

API

Symbol keys are not copied over to the new object.

includeKeys(source, filter)

includeKeys(source, keys)

excludeKeys(source, filter)

excludeKeys(source, keys)

source

Type: object

The source object to filter properties from.

filter

Type: (sourceKey, sourceValue, source) => boolean

A predicate function that detemines whether a property should be filtered.

keys

Type: string[]

An array of property names to be filtered.

Related

• map-obj - Map object keys and values into a new object