Question

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What do these operators do?

I’m working with some javascript for html 5’s canvas. I’m looking at some existing code and I’ve come across the following:

element.height >> 1
element.width >> 1

Its used as part of some arithmetic.

I am using prototype.js as well, if this helps.

Answer 1

>> is the bitwise shifting operator. So >> 1 basically shifts the binary representation of the number on the left by one to the right. This is equal to an integer division by 2.

So element.height >> 1 equals to Math.floor( element.height / 2)