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var keyword inside for loop statement explanation

I trying to understand some concepts of java script. I wrote this code:

<html>
    <button>Click</button>
    <button>Click</button>
    <button>Click</button>
    <button>Click</button>
    <button>Click</button>
    <script>
        var btn = document.getElementsByTagName("button");
        for(var i = 0; i<5; i++){
         btn[i].onclick = function(){alert(i)}
        }
    </script>
</html>

for each click on each button I will get the same result "5", if I would change the var to let, I will get the correct result. can someone explain why it happened?

about 4 years ago · Juan Pablo Isaza

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var keyword inside for loop statement explanation

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