JavaScript Struggles - Part 4 | Comparing

Here we go again!

This one is very easy but we all have to know it, you may already heard about it somewhere else too.
If you weren't familiar with JS's comparing way keep going. If you're then this post is not for you. 😊👏🏻

There's two ways of comparing variables in JavaScript:

• Two Equal Signs (==)
• Three Equal Signs (===)

Two Equal Signs (==)

Most majority of programming languages uses == as the one and only comparing operator, but in JavaScript we're special. 😏

== is only comparing the value of the variable, ignoring the data type of it; so if there's a number that is equal to a number inside the string it'll always be true.

E.g.

console.log('0' == 0); // Outputs: true

console.log(1 == true); // Outputs: true

The data type of the variable will not be changed after the comparison

let num = 0;
let word = "";

console.log(num == true); // Outputs: false
console.log(word == true); // Outputs: false

num = 5;
word = "Hey!";

console.log(num == true); // Outputs: true
console.log(word == true); // Outputs: true

Three Equal Signs (===)

We use this as the normal comparing operator, that's only working with JavaScript, TypeScript, PHP.

What === actually does is that it compares the value and the data type.

E.g.

console.log("0" === 0); // Outputs: false

/* They must be of the same data type. */
console.log("0" === "0"); // Outputs: true

=== is the most used one. Probably because it's the easy way of conparing and we all understand it even if JavaScript wasn't your first language.

Thanks for reading! 😌

I hope this may be helpful for someone.