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strict not equal operator Javascript

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

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.

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


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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at