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<!DOCTYPE html>
<html>
<body>
​
<p>Remove the comment (at the beginning of the lines) to test each case:</p>
​
<p id="demo"></p>
​
<script>
var x = 5;
//x = 5 + 7;    // x.valueOf() is 12, typeof x is a number
//x = 5 + "7";  // x.valueOf() is 57, typeof x is a string
//x = "5" + 7;  // x.valueOf() is 57, typeof x is a string
//x = 5 - 7;    // x.valueOf() is -2, typeof x is a number
//x = 5 - "7";  // x.valueOf() is -2, typeof x is a number
//x = "5" - 7;  // x.valueOf() is -2, typeof x is a number
//x = 5 - "x";  // x.valueOf() is NaN, typeof x is a number
​
document.getElementById("demo").innerHTML = x.valueOf() + " " + typeof x;
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_best_valueof by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 13:23:09 GMT -->
</html>
​
​
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