The Object.is() method determines whether two values are the same value | Javascript

 Object.is('foo', 'foo');     // true

Object.is(null, null);       // true

Object.is(Nan, Nan);       // true 😱

const foo = { a: 1 };
const bar = { a: 1 };
Object.is(foo, foo);         // true
Object.is(foo, bar);         // false

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AI Explanation

This code snippet demonstrates the use of the Object.is method in JavaScript to compare values. Let's break down each statement: 1. `Object.is('foo', 'foo');` - This statement compares two strings with the same value 'foo'. It will return `true` because both strings are the same. 2. `Object.is(null, null);` - This statement compares two `null` values. It will return `true` because both values are `null`. 3. `Object.is(NaN, NaN);` - In this statement, there is a typo (`Nan` should be `NaN`). The correct statement should be `Object.is(NaN, NaN);`. This statement compares two `NaN` values. Surprisingly, it returns `true` because `Object.is` treats `NaN` as a special case and considers two `NaN` values to be equal. 4. `const foo = { a: 1 };` `const bar = { a: 1 };` `Object.is(foo, foo);` `Object.is(foo, bar);` - These statements create two objects `foo` and `bar` with the same property with the same value. When comparing `foo` with itself, it returns `true` because they are the same object reference. When comparing `foo` with `bar`, it returns `false` because they are two separate objects, even though they have the same properties. Overall, the `Object.is` method is used for strict equality comparison and differs from the `===` and `==` operators in a few specific cases, such as `NaN` comparison and object comparison.