What is the right way to iterate through an array in Ruby?

Ruby Common Questions
1

What is the right way to iterate through an array in Ruby?

2

There are many ways to iterate through an array in Ruby.

The most common way is to use the each method:

array.each do |element|
  # do something with element
end

If you need the index of each element as well as the element itself, you can use the each_with_index method:

array.each_with_index do |element, index|
  # do something with element and index
end

If you just need the index of each element, you can use the each_index method:

array.each_index do |index|
  # do something with index
end

If you need to iterate over two arrays at the same time, you can use the zip method:

array1.zip(array2).each do |element1, element2|
  # do something with element1 and element2
end

If you need to iterate over an array in reverse, you can use the reverse_each method:

array.reverse_each do |element|
  # do something with element
end

If you need to iterate over an array multiple times, you can use the cycle method:

array.cycle do |element|
  # do something with element
end

This will loop forever, so be sure to break out of the loop somewhere.

There are many other ways to iterate through an array in Ruby. These are just some of the most common.

3 Likes
3

Additionally, you can generate a new array starting from the first as a base using “map”:

array = [1, 2, 3, 4, 5]
new_array = array.map do |element|
              element +1
            end
new_array # [2, 3, 4, 5, 6]
1 Like
4

def matrix_params(arr)
m = u = o = 0
arr.each do |i|
i.each do |j|
if i == j
m += arr[i][j]
elsif i > j
u += arr[i][j]
else
o += arr[i][j]
end
end
end
puts {“m” => m, “u” => o, “o” => u}
end

hello, help me with this code

5

In Ruby, there are multiple ways to iterate through an array. Here are a few commonly used methods:

  1. Using the each method:

array.each do |element|