To validate an integer in JavaScript, use a regular expression:
var NumberToTest = 15;
var IsFound = /^-?\d+$/.test(NumberToTest);
document.write(IsFound);
The ^ symbol specifies that the tested value must begin with a digit (i.e., there can be no non-numeric data before the numeric data begins). The $ symbol is similarly used to ensure that no non-numeric data comes after the [...]
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