CODEWITHSUNDEEP
ruby
wheresmycookie
wheresmycookie

Reputation: 763

Combining arrays of arrays in ruby

Beginner Ruby question here: What's the most idiomatic way to combine two arrays of arrays in Ruby?

a = [[0, 0, 0]]
b = [[1, 1, 1]]

I'd like to find c such that

c = [[0, 0, 0], [1, 1, 1]]

I've been able to solve this with a loop, but can't seem to find a way that "feels" correct.

Upvotes: 0

Views: 78

Answers (4)

gabrielhilal
gabrielhilal

Reputation: 10769

You could also use concat:

a = [[0, 0, 0]]
b = [[1, 1, 1]]

c = a.concat(b)
c #=> [[0, 0, 0], [1, 1, 1]]

But please note it appends the elements of b to a, which might be less expensive than a + b (new array by concatenating a and b) but modifies the a.

a #=> [[0, 0, 0], [1, 1, 1]]
b #=> [[1, 1, 1]]
c #=> [[0, 0, 0], [1, 1, 1]]

Upvotes: 1

steenslag
steenslag

Reputation: 80065

chain is a recently added method on Enumerables

a = [[0, 0, 0]]
b = [[1, 1, 1]]
p a.chain(b).to_a # => [[0, 0, 0], [1, 1, 1]]

Upvotes: 4

iGian
iGian

Reputation: 11183

Why not just concatenation Array#+, a + b?

a = [[0, 0, 0]]
b = [[1, 1, 1]]


c = a + b
c #=> [[0, 0, 0], [1, 1, 1]]

Upvotes: 3

David Aldridge
David Aldridge

Reputation: 52336

One method would be:

c = [a.flatten] + [b.flatten]

although you could also:

c = [a.first] + [b.first]

I expect there are a few other too.

Upvotes: 1

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