JavaScript Program to Check if a Number is Float or Integer

To understand this example, you should have the knowledge of the following JavaScript programming topics:

Example 1: Using Number.isInteger()

Output

hello is not a number
44 is integer.
3.4 is a float value.
-3.4 is a float value.
NaN is not a number

In the above program, the passed value is checked if it is an integer value or a float value.

The typeof operator is used to check the data type of the passed value.
The isNaN() method checks if the passed value is a number.
The Number.isInteger() method is used to check if the number is an integer value.

Output

44 is an integer.
-44 is an integer.
3.4 is a float value.
-3.4 is a float value.

In the above example, the regex pattern is used to check if the passed argument is an integer value or float value.

The pattern /^-?[0-9]+$/ looks for the integer value.

The test() method of the RegExp object is used to test the pattern with the given value.

Note: The above program only works for numbers.

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