December 2001
Intermediate to advanced
480 pages
9h 22m
English
Content preview from JavaScript Design
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Properties in Functions
JavaScript functions are objects, and, as such, they contain properties. An important built-in property is length. The length property is a read-only one that returns the number of arguments that are supposed to be in a function. When you define a function, you can put in as many or as few, including zero, arguments in the function as you want. The number of arguments that you include becomes the value of the function’s length.
However, when you actually invoke a function, the number of arguments that you include may not match the number that you defined. The mismatch of defined and invoked arguments need not lead to your program crashing, but if the two are equal, you can be assured that the script is working as structured. ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.