2.1.78 • Published 4 months ago

@thi.ng/equiv v2.1.78

Weekly downloads
3,442
License
Apache-2.0
Repository
github
Last release
4 months ago

equiv

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

About

Extensible deep value equivalence checking for any data types.

Supports:

  • JS primitives
  • Arrays
  • Plain objects
  • ES6 Sets / Maps
  • Date
  • RegExp
  • Types with IEquiv implementation

Status

STABLE - used in production

Search or submit any issues for this package

Installation

yarn add @thi.ng/equiv

ES module import:

<script type="module" src="https://cdn.skypack.dev/@thi.ng/equiv"></script>

Skypack documentation

For Node.js REPL:

# with flag only for < v16
node --experimental-repl-await

> const equiv = await import("@thi.ng/equiv");

Package sizes (gzipped, pre-treeshake): ESM: 487 bytes

Dependencies

None

API

Generated API docs

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.

Furthermore, 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?: any) {
        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

If this project contributes to an academic publication, please cite it as:

@misc{thing-equiv,
  title = "@thi.ng/equiv",
  author = "Karsten Schmidt",
  note = "https://thi.ng/equiv",
  year = 2016
}

License

© 2016 - 2021 Karsten Schmidt // Apache Software License 2.0

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