decoding someone elses code what is this?

rubyonrails-talk
1

What does this ">>" mean? As in...

first_payment_in_series_date >> 3

I have never used this nor have i seen it before.

2

But you *do* know Ruby has documentation, right? :slight_smile:

3

means bit shift

eg

8 >> 3 means shift value by 3 bits to the right .. result is 1 (8 = 1000b, after shift is 0001b = 1)

opposite is << …

1 << 3 = 8

tom

ps: in asm it is shl or shr

4

Yes i found it sorry for the trouble. There is so much crap in the code I'm looking at I am having a hard time telling what is what. this can be deleted!

5

means bit shift

eg

8 >> 3 means shift value by 3 bits to the right .. result is 1 (8 = 1000b, after shift is 0001b = 1)

opposite is << …

1 << 3 = 8

tom

ps: in asm it is shl or shr

If first_payment_in_series_date was an Integer, then that might be the case, but I'd suspect that a Date is much more likely with that name.

Look for the documentation for Date#>>

-Rob

(posted so future readers will not be lead too far astray)

6

>> means bit shift

eg

8 >> 3 means shift value by 3 bits to the right .. result is 1 (8 = 1000b, after shift is 0001b = 1)

opposite is << …

1 << 3 = 8

Of course, being ruby it can mean different things on different objects. For Date objects for example >> 3 advances the date by 3 months (and << moves in the other direction)

Fred

7

nate hunter wrote in post #1018531:

What does this ">>" mean? As in...

first_payment_in_series_date >> 3

I have never used this nor have i seen it before.

The first thing you should do is try to determine the type of the thing calling the method. The method is '>>' and the thing calling the method is on the left. Because the programmer used good variable names, it makes it easy to determine what type the left side is.

8

means bit shift

eg

8 >> 3 means shift value by 3 bits to the right .. result is 1 (8 = 1000b, after shift is 0001b = 1)

opposite is << …

1 << 3 = 8

tom

ps: in asm it is shl or shr

If first_payment_in_series_date was an Integer, then that might be the case, but I'd suspect that a Date is much more likely with that name.

Look for the documentation for Date#>>

-Rob

(posted so future readers will not be lead too far astray)

you're right. When date, it moves by months, I've overlooked the _date in variable name

tom