Strict and Loose Equality Example in JavaScript

equality.js

// Use strict equality when comparing variables of the same type
let age = 25;
let legalAge = 21;
console.log(age === legalAge); // false

// Use loose equality when comparing variables that may be a string or a number
let input = "25";
let number = 25;
console.log(input == number); // true

// Use loose equality when comparing a variable to null or undefined
let name;
console.log(name == undefined); // true