Greetings everyone!
Working my way through the book “Flash MX 2004 games most wanted” from Friend of Ed.
The book assumes a bit more AS knowledge than I have atm so I’m using a lot of time checking every bit of code - making sure I know what is going on on each line. In one of the program codes (one that makes a tile-based gameboard) I’ve come across the bitwise OR operator written in AS as |. What is the use of this operator? In the Flash 8 AS helpfile it says:
expression1 | expression2
Converts expression1 and expression2 to 32-bit unsigned integers, and returns a 1 in each bit position where the corresponding bits of either expression1 or expression2 are 1. Floating-point numbers are converted to integers by discarding any digits after the decimal point. The result is a new 32-bit integer.
They also give the following code example:
// 15 decimal = 1111 binary
var x:Number = 15;
// 9 decimal = 1001 binary
var y:Number = 9;
// 1111 | 1001 = 1111
trace(x | y); // returns 15 decimal (1111 binary)
Problem is I can’t wrap my head around the logic of this operator - example: why does the code above output 15 and not something else? Basically my question is this: how does | work? And how is it usefull to me when writing code?
Any hints to this are more than welcome!
