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    4.0.14 • Public • Published


    comparejs implements JavaScript's comparison operators the way you would expect them to be.


    Category Status
    Version npm
    Dependencies David
    Dev dependencies David
    Build GitHub Actions
    License GitHub


    $ npm install comparejs

    Quick Start

    To use comparejs you need to reference it from your application by adding the following line:

    const { compare } = require('comparejs');

    If you use TypeScript, use the following code instead:

    import { compare } from 'comparejs';


    • Supports comparison of array, boolean, function, null, number, object, string and undefined.
    • Supports comparison of native data types and constructor-created data types, such as number and new Number().
    • Supports comparison of objects and arrays using deep-equal.
    • Supports comparison of objects and arrays with <, <=, > and >= by handling them as subsets.
    • Supports comparison of objects by structure.
    • Supports comparison with undefined correctly, as <= and >= are problematic in plain JavaScript.
    • Supports comparison in a perfectly type-safe way out-of-the-box.
    • Supports comparison by equality and identity, depending on what makes sense.

    Basic usage

    Now you are able to use the various comparison operators. All you need to do is access the compare object and use its functions:

    Operator  Alias Description
    equal(left, right) eq(left, right) equal
    notEqual(left, right) ne(left, right) not equal
    lessThan(left, right) lt(left, right) less than
    lessThanOrEqual(left, right) lte(left, right) less than or equal
    greaterThan(left, right) gt(left, right) greater than
    greaterThanOrEqual(left, right) gte(left, right) greater than or equal
    identity(left, right) id(left, right) identity

    Please note that each comparison operator works on each combination of types and does what you would expect it to do.

    Structure comparison operators

    For objects, there are special operators that compare by structure. Among other things, they can be used to verify objects against interfaces:

    Operator Alias Description
    equalByStructure(left, right) eqs(left, right) equal by structure
    notEqualByStructure(left, right) nes(left, right) not equal by structure
    lessThanByStructure(left, right) lts(left, right) less than by structure
    lessThanOrEqualByStructure(left, right) ltes(left, right) less than or equal by structure
    greaterThanByStructure(left, right) gts(left, right) greater than by structure
    greaterThanOrEqualByStructure(left, right) gtes(left, right) greater than or equal by structure

    Please note that these operators only work for objects. For any other type, they return false.

    Running quality assurance

    To run quality assurance for this module use roboter:

    $ npx roboter


    npm i comparejs

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