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=== vs == in javascript

Note: This article is published on 11/19/2024.

This article that I put it in category of AI is because it is absolutely a AI product. See note at the bottom.

 

In JavaScript, === and == are both comparison operators, but they behave differently:

=== (Strict Equality):

  • Compares both the value and the type of the operands.
  • Returns true only if both the value and type are identical.
  • No type coercion is performed. 

Example:

console.log(1 === 1);    // true
console.log(1 === '1');  // false (different types)
console.log('1' === '1'); // true
console.log(0 === false); // false (different types)

== (Loose Equality):

  • Compares the value of the operands after performing type coercion if necessary.
  • Returns true if the values are equal after type coercion.

Example:

console.log(1 == 1);       // true
console.log(1 == '1');     // true (type coercion)
console.log('1' == '1');   // true
console.log(0 == false);   // true (type coercion)

Which one should you use?

  • In most cases, === is recommended because it avoids unexpected results due to type coercion.
  • Use == only when you explicitly want to allow type coercion.

(Generative AI is experimental.)

 

Note:

This article that I put it in category of AI is because it is absolutely a AI product. When you google this:

you will get 

this is exactly what I want to know, and what I need to learn, by which, I made this article.

However, on the other hand, for a little bit more complex issue, even similar issue, AI does not give a solution or good solution, such as

I believe, it will be in progress. Say, next year this time, this one might have a AI explanation.
 

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