check if input is a number javascript
// Another option is typeof which return a string if (typeof(val) === 'number') { // Guess what, it's a bloody number! }
check if input is a number javascript
// Another option is typeof which return a string if (typeof(val) === 'number') { // Guess what, it's a bloody number! }
javascript check if number
function isNumber(n) { return /^-?[\d.]+(?:e-?\d+)?$/.test(n); } ------------------------ isNumber('123'); // true isNumber('123abc'); // false isNumber(5); // true isNumber('q345'); // false isNumber(null); // false isNumber(undefined); // false isNumber(false); // false isNumber(' '); // false
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