Question

Possible Duplicate:
Odd ( or even ) entries in a Ruby array

Suppose i have a following array

arr = ["Value0","Value1","Value2","Value3","Value4","Value5","Value6","Value7","Value8"]

I want to delete the alternate element such that my o/p array will something like following

["Value0", "Value2", "Value4", "Value6", "Value8"]

i.e it should delete the elements at the odd position.

Answer 1

I don’t feel it is the fastest way but you could do

>> arr.reject {|v| arr.index(v).odd?}
#=> ["Value0", "Value2", "Value4", "Value6", "Value8"]

or

>> arr.each_slice(2).map(&:first)
#=> ["Value0", "Value2", "Value4", "Value6", "Value8"]