@thi.ng/equiv

This project is part of the @thi.ng/umbrella monorepo.

About

Extensible deep equivalence checking for any data types. Supports:

• JS primitives
• arrays
• plain objects
• ES6 Sets / Maps
• Date
• RegExp
• types with .equiv() implementations (IEquiv interface)

This feature was previously part of the @thi.ng/api package.

Installation

yarn add @thi.ng/equiv

Dependencies

• @thi.ng/checks

Usage examples

import { equiv } from "@thi.ng/equiv";

equiv({a: {b: [1, 2]}}, {a: {b: [1, 2]}});
// true

Implement IEquiv interface

This is useful & required for custom types to take part in equiv checks, by default only plain objects & array are traversed deeply.

Furthemore by implementing this interface we can better control which internal values / criteria are required to establish equivalence. In this example we exclude the meta property and only check for same type & children equality.

import { IEquiv } from "@thi.ng/api";
import { equiv } from "@thi.ng/equiv";

class Node implements IEquiv {

    meta: any;
    children: any[];

    constructor(children: any[], meta?) {
        this.children = children;
        this.meta = meta;
    }

    equiv(o: any) {
        return o instanceof Node && equiv(this.children, o.children);
    }
}

equiv(new Node([1,2,3], "foo"), new Node([1,2,3], "bar"));
// true

Authors

• Karsten Schmidt

License

© 2018 Karsten Schmidt // Apache Software License 2.0