How to flatten an array of arrays - but not all the way down

Question

What's the best way to convert this

[[["Club three Team one", 7800], ["Club three Team two", 7801]], [], [["Club four Team one", 7807], ["Club four Team two", 7808]], []]

into

[["Club three Team one", 7800], ["Club three Team two", 7801], ["Club four Team one", 7807], ["Club four Team two", 7808]]

in ruby? flatten converts this all the way down to

["Club three Team one", 7303, "Club three Team two", 7304, "Club four Team one", 7310, "Club four Team two", 7311]

fl00r · Accepted Answer · 2011-04-10 15:06:04Z

125

use flatten(1) http://apidock.com/ruby/Array/flatten

your_array = [[["Club three Team one", 7800], ["Club three Team two", 7801]], [], [["Club four Team one", 7807], ["Club four Team two", 7808]], []]
your_array.flatten(1)
#=> [["Club three Team one", 7800], ["Club three Team two", 7801], ["Club four Team one", 7807], ["Club four Team two", 7808]]

answered Apr 10, 2011 at 15:06

fl00r

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4 Comments

tokland Over a year ago

it may be worth noting, for older Ruby versions: your_array.inject([], :concat)

fl00r Over a year ago

@tokland for big arrays it would be much slower

tokland Over a year ago

@fl00r: Array#concat is in-place in Ruby, so it shouldn't be much slower. I made some tests and it's pretty much the same performance.

fl00r Over a year ago

@tokland I think that inject is slowest part :)

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