August 1999
Intermediate to advanced
1488 pages
72h 53m
English
Content preview from Pure JavaScript
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String.charCodeAt()
JavaScript1.0+, JScript1.0+, ECMAScript1.0+ NES2+, Nav2+, IE3+, Opera3+ Syntax
string.charCodeAt(num)
Description
The charCodeAt() method of an instance of the String object returns the ISO-Latin-1 number of the character located at the indexed, num, position passed. This indexing is done from left to right starting with the 0 (zero) position. If the num passed is not a valid index in the string, –1 is returned.
Example
Listing 6.234 creates an instance of a String object. When the page is loaded, the user is then prompted for an index number. After entering the index number and OK, the ISO-Latin-1 number of the character at that indexed location is written to the document. Notice that there is also a check to see ...
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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.