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Better explanation of list slices

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Step size and list slice syntax was not quite clear. 

Upon seeing li[::-1] as it was previously, I was not sure what this really meant so I looked it up and found that this section of the guide may benefit from more explanation.
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Mark Whiting 2014-02-17 21:07:29 -05:00
parent 5ff5f6c0d8
commit da3b7c3520
1 changed files with 4 additions and 0 deletions
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@ -160,8 +160,12 @@ li[1:3] #=> [2, 4]
li[2:] #=> [4, 3] li[2:] #=> [4, 3]
# Omit the end # Omit the end
li[:3] #=> [1, 2, 4] li[:3] #=> [1, 2, 4]
# Select every second entry
li[::2] #=>[1,4]
# Revert the list # Revert the list
li[::-1] #=> [3, 4, 2, 1] li[::-1] #=> [3, 4, 2, 1]
# Use any combination of these to make advanced slices
# li[start:end:step]
# Remove arbitrary elements from a list with "del" # Remove arbitrary elements from a list with "del"
del li[2] # li is now [1, 2, 3] del li[2] # li is now [1, 2, 3]