JavaScript: Check whether a variable is numeric or not
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
Visual Presentation:
Sample Solution:
JavaScript Code:
// Define a function named is_Numeric that checks if a value is numeric.
function is_Numeric(num) {
// Check if the value can be parsed as a floating-point number and is finite.
return !isNaN(parseFloat(num)) && isFinite(num);
}
// Output the result of checking if 12 is numeric to the console.
console.log(is_Numeric(12));
// Output the result of checking if 'abcd' is numeric to the console.
console.log(is_Numeric('abcd'));
// Output the result of checking if '12' is numeric to the console.
console.log(is_Numeric('12'));
// Output the result of checking if ' ' (empty string) is numeric to the console.
console.log(is_Numeric(' '));
// Output the result of checking if 1.20 is numeric to the console.
console.log(is_Numeric(1.20));
// Output the result of checking if -200 is numeric to the console.
console.log(is_Numeric(-200));
Output:
true false true false true true
Flowchart:
Live Demo:
See the Pen javascript-math-exercise-16 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus.
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