Question

i have 4 arrays.

["one", "two", "three"]
["1", "2", "3"
["un", "deux", "trois"]
["ichi", "ni", "san"]

is it possible to concatenate each element in their respective arrays ?

so i end up with single lines of string like like

"one, 1, un, ichi"\n
"two,2, deux,ni"\n

and so on…

is it possible to do this in one loop ?

for i in (1..array1.count)

puts array1[i] + ", " + array2[i] + ", " + array3[i] + ", " + array4[i]

end

What happens when there might be unpredictable number of arrays & they are each unequal size?

Answer 1

Well if you know that they were all the same length:

(0...array1.length).each{|i|puts array1[i] + ", " + array2[i] + ", " + array3[i] + ", " + array4[i]}

Edit: The Following code works

array1 = ["one", "two", "three"]
array2 = ["1", "2", "3"]
array3 = ["un", "deux", "trois"]
array4 = ["ichi", "ni", "san"]

(0...array1.length).each{|i| puts array1[i] + ", " + array2[i] + ", " + array3[i] + ", " + array4[i]}

Edit2: what happens if you dont know how many arrays there will be?

I would suggest making an array of arrays; a list of arrays. Make an array of arrays (essentially a 2D array but it can’t be indexed like one) and with it print every line one by one for each array in the arrayList.

This code works:

array1 = ["one", "two", "three"]
array2 = ["1", "2", "3"]
array3 = ["un", "deux", "trois"]
array4 = ["ichi", "ni", "san"]

arrayList = []
arrayList.push(array1, array2, array3, array4)

p arrayList

(0...array1.length).each{|i|
    (0...arrayList.length).each{|j|
        print arrayList[j][i] + ", "
    }
    print "\n"
}