Equality Checker

A utility function to compare values using different equality methods in JavaScript.

Installation

npm install equality-checker

Usage

const check = require("equality-checker");

// Basic usage
check(5, "5");
check(0, false);
check(null, undefined);

// With custom message
check(
  { id: 1 },
  { id: 1 },
  {
    message: "These are different objects in memory",
  }
);

API

check(a, b, options)

Compares two values using three different equality methods:

• Loose equality (==)
• Strict equality (===)
• Object.is()

Parameters

• a - First value to compare
• b - Second value to compare
• options - Optional object with:
  • message - Custom message to display

Output

The function logs the comparison results to the console with visual indicators:

• ✅ for true
• ❌ for false

Examples

const check = require("equality-checker");

check(5, "5");
// - Comparing [5] and ["5"] -
// Loose equality: ✅ true
// Strict equality: ❌ false
// Object is: ❌ false

check(NaN, NaN);
// - Comparing [null] and [null] -
// Loose equality: ❌ false
// Strict equality: ❌ false
// Object is: ✅ true

const obj = { id: 1 };
check(obj, obj, { message: "Same object reference" });
// - Comparing [{"id":1}] and [{"id":1}] -
// Same object reference
// Loose equality: ✅ true
// Strict equality: ✅ true
// Object is: ✅ true