isInteger

The isInteger function checks if a value is a finite integer number.

Syntax

isInteger(value)

Parameters

Name	Type	Description
value	number	Value to be checked.

Return Value

Type	Description
boolean	true if the value is a finite integer number, else false.

Examples

isInteger(10);    // true
isInteger(3.14);  // false
isInteger(NaN);   // false

Notes

• Throws a TypeError if the value is not a number.
• Useful for mathematical validations and type control.

References

• MDN: Number.isInteger()