parseInt

Summary

Converts a string to an integer.

Syntax

parseInt( numString , [ radix ])

numString

Required. A string to convert into a number.

radix

Optional. A value between 2 and 36 that specifies the base of the number in numString. If this argument is not supplied, strings with a prefix of ‘0x’ are considered hexadecimal. All other strings are considered decimal.

Examples

parseInt("123.45");  // returns 123
parseInt("abc");  // returns NaN
parseInt("12abc");  // returns 12

Remarks

The parseInt function returns an integer 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 function.

See also

Other articles

• isNaN Function
• parseFloat Function
• String Object
• valueOf Method (Object)

Attributions

• Microsoft Developer Network: Article