parseInt Method

numString

Required. A string to convert into a number.

radix

Optional. A value between 2 and 36 indicating the base of the number contained in numString. If not supplied, strings with a prefix of '0x' are considered hexadecimal and strings with a prefix of '0' are considered octal. All other strings are considered decimal.

The parseInt method returns a whole number value equal to the number contained in numString. If no prefix of numString can be successfully parsed into an integer, NaN (not a number) is returned.

You can test for NaN using the isNaN method.

In following example, the parseInt method is used to convert two strings to numbers.

parseInt("abc")     // Returns NaN.
parseInt("12abc")   // Returns 12.

Version 1

Reference