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How to check if a variable is boolean in JavaScript?
To check if a variable is Boolean in JavaScript, use the typeof operator.
Example
You can try to run the following code to check for a Boolean variable −
<html>
<head>
<title>JavaScript Boolean</title>
</head>
<body>
<script>
var answer = true;
if(typeof(answer) === "boolean") {
alert("Boolean");
} else {
alert("Not a Boolean");
}
</script>
</body>
</html>
Updated on 15-Jun-2020 06:27:58
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