parseInt

Availability

Flash Player 5.

Usage

parseInt(expression [, radix])

Parameters

expression A string to convert to a integer.

radix Optional; an integer representing the radix (base) of the number to parse. Legal values are from 2 to 36.

Returns

A number or NaN.

Description

Function; converts a string to an integer. If the specified string in the parameters cannot be converted to a number, the function returns NaN. Strings beginning with 0x are interpreted as hexadecimal numbers. Integers beginning with 0 or specifying a radix of 8 are interpreted as octal numbers. White space preceding valid integers is ignored, as are trailing nonnumeric characters.

Example

The following examples use the parseInt function to evaluate various types of numbers.

parseInt("3.5")

// returns 3

parseInt("bar")
// returns NaN

parseInt("4foo")
// returns 4

The following are examples of hexadecimal conversions:

parseInt("0x3F8")
// returns 1016

parseInt("3E8", 16)
// returns 1000

The following is an example of a binary conversion:

parseInt("1010", 2)
// returns 10 (the decimal representation of the binary 1010)

The following are examples of octal number parsing:

parseInt("0777")
parseInt("777", 8)
// returns 511 (the decimal representation of the octal 777)