Test if a value is a number having a negative integer value.

Test if a value is a number having a nonnegative integer value.

Test if a value is a number having a nonpositive integer value.

Test if a value is a number having a positive integer value.

Test if a value is a number having an integer value.

Test if a value is a number having a safe integer value.

Test if a finite double-precision floating-point number is a safe integer.

Test if a finite double-precision floating-point number is an integer.

Test if a finite double-precision floating-point number is a negative integer.

Test if a finite double-precision floating-point number is a nonnegative integer.

Test if a finite double-precision floating-point number is a nonpositive integer.

Test if a finite single-precision floating-point number is an integer.

Test if a finite single-precision floating-point number is a nonnegative integer.

An ES-spec-compliant Number.isInteger shim/polyfill/replacement that works as far down as ES3

Determine whether the passed value is an integer.

JavaScript functions that check if the passed argument meets a data type requirement.