srchulo srchulo - 1 month ago 6
Ruby Question

add element to ruby array return new array

I would like to add an element to an array but without actually changing that array and instead it returning a new one. In other words, I want to avoid:

arr = [1,2]
arr << 3


Which would return:

[1,2,3]


Changing arr itself. How can I avoid this and create a new array?

Answer

You can easily add two arrays in Ruby with plus operator. So, just make an array out of your element.

arr = [1, 2]
puts arr + [3]
# => [1, 2, 3]
puts arr
# => [1, 2]