JavaScript: Find out if a number is a natural number or not

Last update on August 19 2022 21:50:50 (UTC/GMT +8 hours)

JavaScript Math: Exercise-12 with Solution

Write a JavaScript function to find out if a number is a natural number or not.

Note:
Natural numbers are whole numbers from 1 upwards : 1, 2, 3, and so on ... or from 0 upwards in some area of mathematics: 0, 1, 2, 3 and so on ...
No negative numbers and no fractions.
Test Data:
console.log(is_Natural(-15));
console.log(is_Natural(1));
console.log(is_Natural(10.22));
console.log(is_Natural(10/0));
Output:
false
true
false
false

Pictorial Presentation:

JavaScript: Math - Find out if a number is a natural number or not

Sample Solution:-

HTML Code:

<!DOCTYPE html>
  <html>
  <head>
  <meta charset="utf-8">
  <title>Checking for Natural Number</title>
  </head>
  <body>
</body>
  </html>

JavaScript Code:

function is_Natural(n) 
      {
	   if (typeof n !== 'number') 
	        return 'Not a number'; 
			
	 return (n >= 0.0) && (Math.floor(n) === n) && n !== Infinity;
	    }
console.log(is_Natural(-15));
console.log(is_Natural(1));
console.log(is_Natural(10.22));
console.log(is_Natural(10/0));

Sample Output:

false
true
false
false

Flowchart:

$Flowchart: JavaScript Math- Find out if a number is a natural or not$

Live Demo:

See the Pen javascript-math-exercise-12 by w3resource (@w3resource) on CodePen.

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