Store intermediate values into array with Ruby inject

Question

I want to store ruby inject values into array I found one good example (on site http://matthewcarriere.com/2008/06/23/using-select-reject-collect-inject-and-detect/) but its returning Fixnum instead of array.

 [1,2,3,4].inject([]) {|acc,n| acc << n+n}

this is returning 262144. However I want array as [2, 4, 6, 8]. Any help is appreciated.

user2526587 · Accepted Answer · 2016-09-14 17:55:44Z

1

it works in my machine.

Have you tried it in a new irb session?

Which version of ruby are you using?

$ ruby  --version
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]

$ irb --version
irb 0.9.6(09/06/30)

$ irb
irb(main):001:0> [1,2,3,4].inject([]) {|acc,n| acc << n+n}
=> [2, 4, 6, 8]
irb(main):002:0>

answered Sep 14, 2016 at 17:55

user2526587

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4 Comments

Manvi Over a year ago

version is same except mine is windows. basically I want array from this but its giving me error as: irb(main):001:0> (0..30).inject([1,0]) { |(i,j)| i << i+j } TypeError: nil can't be coerced into Fixnum from (irb):1:in +' from (irb):1:in block in irb_binding' from (irb):1:in each' from (irb):1:in inject' from (irb):1 from C:/Ruby23-x64/bin/irb.cmd:19:in `<main>'

user2526587 Over a year ago

You are trying to add an integer with an array. i + j => array + Fixnum. maybe you are trying to do this. (0..30).inject([1,0]) { |i,j| i << j +j }

Manvi Over a year ago

oh you are correct, thanks I got why I am getting error. but I want to add previous number of array (i.e. i want to get fibonacci series till 30th position). I will really appreciate If you can guide.

user2526587 Over a year ago

(0..30).inject([0,1]) { |i| i << i[-1] + i[-2] }

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