July 1998
Intermediate to advanced
1456 pages
65h 5m
English
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Name
parseFloat() — NN 2 IE J1 ECMA 1
Synopsis
parseFloat(string)Returns a number value (either an integer or floating-point number)
of the numerals in the string passed as a parameter. The string value
must at least begin with a numeral, or the result is
NaN. If the string starts with numbers but changes
to letters along the way, only the leading numbers are converted to
the integer. Therefore, you can use the expression:
parseFloat(navigator.appVersion)
to extract the complete version number (e.g., 4.03) that leads the otherwise long string that is returned from that property.
If the converted value does not have any nonzero values to the right of the decimal, the returned value is an integer. Floating-point values are returned only when the number calls for it.
Returned Value
Number.
Parameters
-
string Any string that begins with one or more numerals.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.