How does slice work?

Ruby
1

How does the slice method work? If I want to write:

x.slice(parameter 1, parameter 2)

what do the parameters specify in terms of what part of x (say it’s a
sentence) the program slices?

Thanks!

2

On Tue, Feb 15, 2011 at 5:46 PM, Gaba L.
[email protected] wrote:

How does the slice method work? If I want to write:

x.slice(parameter 1, parameter 2)

what do the parameters specify in terms of what part of x (say it’s a
sentence) the program slices?

ri String#slice Array#slice

robert

3

Thanks - I’m still a little bit confused. Where does the slice
begin/stop slicing?

4

It selects the number of elements given by the second parameter,
starting at the index given by the first parameter.

On Tue, Feb 15, 2011 at 11:15 AM, Gaba L.

5

Thanks - very clear!

6

You pick a starting point to slice and then a number of items to
slice. For example, if you write:

“0123456789”.slice(i, size)

then you will slice starting after the i-th character, and for
size more characters, or until the end of the sequence, whichever
comes first. For example,

“0123456789”.slice(5, 3)

will yield “567”. We start at “5” because the i = 5th character is
“4”, and “5” is right after that. Then we take size = 3 characters in
all, yielding “567”.

By contrast, if you wrote,

“abcdefgh”.slice(5, 10)

you will get “fgh”, because we can’t take any more characters after
“h” from the sequence.

~ jf

John F.
Principal Consultant, BitsBuilder
LI: http://www.linkedin.com/in/johnxf
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