August 2006
Intermediate to advanced
1018 pages
34h 13m
English
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Name
parseFloat( ): convert a string to a number — ECMAScript v1
Synopsis
parseFloat(s)Arguments
-
s The string to be parsed and converted to a number.
Returns
The parsed number, or NaN
if s does not begin with a valid
number. In JavaScript 1.0, parseFloat(
) returns 0 instead of NaN when s
cannot be parsed as a number.
Description
parseFloat( ) parses and
returns the first number that occurs in
s. Parsing stops, and the value is
returned, when parseFloat( )
encounters a character in s that is not a
valid part of the number. If s does not
begin with a number that parseFloat(
) can parse, the function returns the not-a-number value
NaN. Test for this return value
with the isNaN( ) function. If
you want to parse only the integer portion of a number, use parseInt( ) instead of parseFloat( ).
See Also
isNaN( ), parseInt( )
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