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isEq -- Deep-compare objects

isEq is a very tiny module that deep compares objects or arrays.

Although its intention is deep comparison, isEq can compare several datatypes.

Supports

Datatype	Support
Number	✅
String	✅
Boolean	✅
Object	✅
Array	✅
Cyclic Object/Array	✅
Regexp	✅
Function	✅
Symbol	✅

Note: functions and symbols are compared by identity. Regexp is stringified before comparison. Unhandleable inputs fall back to strict equality (===)

Installation

Node:

npm install --save @codefeathers/iseq

In the browser:

<script src="https://unpkg.com/@codefeathers/iseq">

Usage

isEq(<sourceObject>, <compareObject>, [comparisonKeys])

where if comparison keys are not given, compareObject is compared against all keys of sourceObject.

Example

So you want to filter all the entities in Steins;Gate that have the property isEvil: true.

var entities = [
    {
        name: 'Future Gadget Laboratory',
        isEvil: false,
        after: 'Disrupting the status quo',
        "known-members": [
            { name: 'Okabe Rintarou', gender: 'Male', occupation: 'University student' },
            { name: 'Mayuri Shiina', gender: 'Female', occupation: 'Maid at May Queen' },
            { name: 'Itaru Hashida', gender: 'Male', occupation: 'Hacker' },
        ],
    },
    {
        name: 'SERN',
        isEvil: true,
        after: 'IBN 5100',
        "known-members": [
            { name: 'Yuugo Tennouji', gender: 'Male', occupation: 'CRT mechanic' },
            { name: 'Moeka Kiryū', gender: 'Female', occupation: 'Part-time editor' },
        ],
    },
    {
        name: 'Strategic Focus',
        isEvil: true,
        after: 'Time travel',
        "known-members": [
            { name: 'Alexis Leskinen', gender: 'Male', occupation: 'Professor' },
        ],
    },
]

const evilEntities = entities.filter(eachEntity => isEq(eachEntity, { isEvil: true }, ['isEvil']));

Written by @MKRhere —