JavaScript Common Mistakes
JavaScript programs may generate unexpected results if a programmer accidentally uses an assignment operator (
<p id="demo"></p>
<script>
var x = 0;
document.getElementById("demo").innerHTML = Boolean(x == 8);
</script>
This
=), instead of a comparison operator (==) in an if statement.<p id="demo"></p>
<script>
var x = 0;
document.getElementById("demo").innerHTML = Boolean(x == 8);
</script>
This
if statement returns false (as expected) because x is not equal to 8:
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