JavaScript: Check whether a variable is numeric or not

Last update on April 22 2023 12:21:58 (UTC/GMT +8 hours)

JavaScript Math: Exercise-16 with Solution

Write a JavaScript function to check whether a variable is numerical or not.

Test Data:
console.log(is_Numeric(12));
console.log(is_Numeric('abcd'));
console.log(is_Numeric('12'));
console.log(is_Numeric(' '));
console.log(is_Numeric(1.20));
console.log(is_Numeric(-200));
Output:
true
false
true
false
true
true

Pictorial Presentation:

$JavaScript: Math - Check whether a variable is numeric or not.$

Sample Solution:-

HTML Code:

<!DOCTYPE html>
  <html>
  <head>
  <meta charset="utf-8">
  <title>Check whether a variable is numeric or not</title>
  </head>
  <body>
</body>
  </html>

JavaScript Code:

function is_Numeric(num) {
  return !isNaN(parseFloat(num)) && isFinite(num);
}

console.log(is_Numeric(12));
console.log(is_Numeric('abcd'));
console.log(is_Numeric('12'));
console.log(is_Numeric(' '));
console.log(is_Numeric(1.20));
console.log(is_Numeric(-200));

Sample Output:

true
false
true
false
true
true

Flowchart:

$Flowchart: JavaScript Math- Check whether a variable is numeric or not$

Live Demo:

See the Pen javascript-math-exercise-16 by w3resource (@w3resource) on CodePen.

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