Identifying the difference between the “Assignment Operator” & “Equality Operator” in JavaScript

Let’s see how to get rid of malfunctioning which occur in our application because of the misuse of “=” operators.

We can use “=” in three ways. They are;

        

     1)    “= “ used as Assignment operator(Assign value for a variable)

var A=10;

     2)   “==” used as Equality operator(check equality )

if(A==10) {

                                                          // Run this

}

      3)   “===” used as Equality operator (check equality )

If(A===10){

                                                        //Run this

}

Now you may wonder what the difference is between operators used in number (2) and (3).

To have a clear idea about this let’s see an example,

var A=123;

var B=”123”;

If(A==B){

          alert(“Variable A is equal to the variable  B”);

}

else{

          alert(“Variable A is not equal to the variable  B”);

}

var A=123;

var B=”123”;

If(A===B){

          alert(“Variable A is equal to the variable  B”);

}

else{

          alert(“Variable A is not equal to the variable  B”);

}

       

So we can say “==” is used for equality (it just simply checks the similarity and does not concern about variable types and so on) and “===”use to check strict equality (used for strict equality check where it also concerns about whether the two value’s and their variable types are same )