Hello Everyone!

In this post we will explore the difference between JS loose equality (==) and strict equality (===) check.

Here is the simplest definition

• Loose equality (==) checks for value only.
• Strict equality (===) checks for value as well as DataType.

But wait, there is something more to it. Let’s understand the workings of both of them one by one.

Strict Equality (===)

Strict equality first checks for DataType, If datatype is same then it checks for value, else it returns false.

Ex:

Copy 
1console.log("55" === 55);
2// false - Because datatype is different even though value is same.

Loose Equality (==)

Loose equality works similar to strict equality. The only difference is that in loose equality if datatype is different, it performs an Implicit type conversion and then compares the value.

Ex:

Copy 
1console.log("55" == 55);
2// true - Because implicit conversion will change string "55" to number 55 then compare value.

If you enjoyed or found this post helpful, please consider joining my weekly Newsletter below.

Thank You!