Bug #9139: each_with_index

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.0.0p247 (2013-06-27 revision 41674) [i686-linux]
• Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

[dostapn (Dima Ostapenko)]

Whats wrong with index?

Array.new(4, Hash.new).each_with_index{ |item, index| item["index"] = index; item["value"] = 10*index; p index;}
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1
2
3
=> [{"index"=>3, "value"=>30},
{"index"=>3, "value"=>30},
{"index"=>3, "value"=>30},
{"index"=>3, "value"=>30}]

[alexeymuranov (Alexey Muranov)]

What's wrong with index? :)

[duerst (Martin Dürst)]

• Status changed from Open to Rejected

Nothing is wrong with index.

Array.new(4, Hash.new) creates an array with four copies of one and the same new hash. Your code is the same as

h = Hash.new
[h, h, h, h].each_with_index{ |item, index| item["index"] = index; item["value"] = 10*index; p index;}

Maybe what you want is this:

Array.new(4) {|_| Hash.new}.each_with_index{ |item, index| item["index"] = index; item["value"] = 10*index; p index;}
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1
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-> [{"index"=>0, "value"=>0},
{"index"=>1, "value"=>10},
{"index"=>2, "value"=>20},
{"index"=>3, "value"=>30}]