如果我有一个数组数组，如何分隔数组？

Question

I have an array that consists of other arrays, for example [[1, 52], [30, 1], [2, 1]] . I would like to use each individual array separately. Using a loop just breaks it down to all the numbers individually.

arrays = [[1, 52], [30, 1], [2, 1]]

irb(main):003:0* arrays.each do |array|
irb(main):004:1* puts array
irb(main):005:1> end
1
52
30
1
2
1
=> [[1, 52], [30, 1], [2, 1]]

I'd like to loop through the arrays. What function can I use for this?

I'd like puts array to display this instead;

[1, 52]
[30, 1]
[2, 1]

Answer 1

You are looping through the arrays. The puts function on its own just makes that difficult to see. Try this:

arrays = [[1, 52], [30, 1], [2, 1]]

arrays.each do |array|
  puts array.inspect
end

Output:

[1, 52]
[30, 1]
[2, 1]

---

See also:

puts [1, 2, 3]

Output:

1
2
3

Answer 2

p array

.................................

You are looping through the arrays, it's just that puts() doesn't output an array so that it looks like an array. When you give puts() an array as an argument, it outputs each element separated by newlines.

Examine the output here:

arrays = [[1, 52], [30, 1], [2, 1]]

arrays.each do |x|
  puts x.class
  puts x.size
  puts x[-1]
end

--output:--
Array
2
52
Array
2
1
Array
2
1

The output shows that each() assigns each inner array to the loop variable x . Likewise, Array methods, like size() and [] work on x .