Ruby 1.8.7 each_with_index index offset

Question

How can i specify which index to start from when using each_with_index on a collection in ruby 1.8.7?

collection.each_with_index do |element, index = 1|
  #do smth
end

Using it like this gives the following error:

syntax error, unexpected '=', expecting '|'
collection.each_with_index do |element, i = 1|

alexkv · Accepted Answer · 2012-05-30 12:08:30Z

2

try this:

collection[4..-1].each_with_index do |element, index|
  #do smth
end

this example will start from fifth element.

answered May 30, 2012 at 12:08

alexkv

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4 Comments

roman Over a year ago

Well, that is not exactly what i need. I need the index to start with 1, index is used further in block.

alexkv Over a year ago

Do I understand correctly? For example you have array ['a', 'b','c','d']. You want to start from element 'b'? Or you want to have first index for example 1 not 0?

jdoe Over a year ago

I guess the author just needs method_that_uses_index(index+1) :)

steenslag Over a year ago

[1,2,3,4,5,6].drop(3).each_with_index {|e,i|p e;p i}is an alternative.

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