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strict not equal operator Javascript   Share / Like

The Javascript strict not equal comparison operator ( !== ) is used to check if the operand on the left is not equal to the operand on the right, as well as evaluating their object types in the comparison. The expression created will then return a value of either "true" or "false" to you.

left_operand !== right_operand

Javascript CODE EXAMPLE
var v1 = "50";
var v2 = 50;
document.write(v1 !== v2);
 

"50" does not strictly equal 50 because the first is a string object and the second is a number object. Even though the values match, the object types do not.

Now run the same exact code using the normal "not equal" operator to see how it does not take object type into consideration in the comparison.

Javascript CODE EXAMPLE
var v1 = "50";
var v2 = 50;
document.write(v1 != v2);
 

 

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