In this article we will learn how to check if variable is a number.
It is very common to check if variable is a number in JavaScript.
Problem
Now we have a problem, which is that we want check if a variable is number or not.
Now let's imagine we have a variable like this:
let a = 10;
And we want to know if this variable is a number or not.
And if we do that we want the result to be true or false
How to solve this problem?
Well, the solution is easy, especially with the Number.isInteger
method.
Check if variable is integer with isInteger
method
We can use Number.isInteger
to check if variable is number or not.
Example
Number.isInteger(34) // true
Number.isInteger(2e64) // true
Number.isInteger('0') // false
Number.isInteger(null) // false
Number.isInteger(Infinity) // false
Number.isInteger(NaN) // false
Number.isInteger(-Infinity) // false
The Number.isInteger() method determines whether the passed value is an integer.
Thank you for reading
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