== vs === Javascript Operator, When use it?

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== vs === Javascipt Operator, When should it be used?

Different Between “==” and “===” Operator Javascript

In comparison operators, Javascript has two operators that often confuse beginners in using them is “==” and “===”. What is the difference between == vs === in Javascript operator? And when is the best time to use it?

Each variable has a value with a certain data type such as Int, Boolean and String. For example:

  • var x = 5; //this is integer
  • var y = true; //this is boolean, true or false
  • var z = “Hello” //this is string

In addition, in javascript also has other data types such as Null, Undefined, Number, BigInt, Symbol and Object. For a more complete explanation of these data types, please read JavaScript data types and data structures.

Same and Identical Operator

Operator “==” known as “same“. Operator “===” known as “identical“.

What is the difference?

To imagine the difference between the two, consider the following example:

a. The first example:

  • var x = 5;
  • var y = “5”

The both variables have similar values, but are not exactly the same. x is an int while y is a string.

b. The second example:

  • var x = true;
  • var y = “true”

Where x is a boolean and y is a string. Both are similar but not the same value.

When is the operator used?

The same operator “==” is used if you want to compare variables base on value, whithout of data type.

Identical operator “===” is used if you want to compare variables based on value and data type.

For example:

const x = '5';
const y = 5;

console.log(x == y) 
console.log(x === y) 

/* Output:
true, because the values are both 5
false, because even though the values are the same, the data types are different
*/

Output:
true, because the values are both 5
false, because even though the values are the same, the data types are different

Hope you can understand it. I hope the article == vs === Javascript Operator is useful.

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