array ending syntax question

[Roger Pack]

irb(main):001:0> [1,2][2..2]
=> []
irb(main):002:0> [1,2][3..3]
=> nil


Is this expected?
the ri says:
Returns nil if the index (or starting index) are out of range.

does the first example match this?
Thanks!
-R

 

[fedzor]

irb(main):001:0> [1,2][2..2]
=> []
irb(main):002:0> [1,2][3..3]
=> nil


Is this expected?
the ri says:
Returns nil if the index (or starting index) are out of range.

does the first example match this?

Yes, because array indices start at 0. So the highest index in the
example is 1.

-------------------------------------------------------|
~ Ari
Some people want love
Others want money
Me... Well...
I just want this code to compile

 

[Alex Gutteridge]

irb(main):001:0> [1,2][2..2]
=> []
irb(main):002:0> [1,2][3..3]
=> nil


Is this expected?
the ri says:
Returns nil if the index (or starting index) are out of range.

does the first example match this?
Thanks!
-R

From the Pickaxe: If the start index equals the array size and a
length or range (as here) parameter is given, an empty array is
returned.

Not sure why you would want that behaviour though...

Alex Gutteridge

Department of Biochemistry
University of Cambridge

 

[Frederick Cheung]

irb(main):001:0> [1,2][2..2]
=> []
irb(main):002:0> [1,2][3..3]
=> nil


Is this expected?
the ri says:
Returns nil if the index (or starting index) are out of range.

does the first example match this?
Thanks!
-R

From the Pickaxe: If the start index equals the array size and a
length or range (as here) parameter is given, an empty array is
returned.

Not sure why you would want that behaviour though...

It sort of makes sense in that in an n item array n is actually a
useful index - it's where the next item will go.

Fred