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

Live Demo:
See the Pen javascript-math-exercise-12 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript function to get the least common multiple (LCM) of more than 2 integers.
Next: Write a JavaScript function to test if a number is a power of 2.
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