Ruby introduces new methods aliases Array#append to Array#push and Array#prepend to Array#unshift since the version 2.5.0.

[Feature #12746]

[Commit f57d515d69b7a35477b9ba5d08fe117df1f1e275]

Let’s refresh our knowledge about the methods Array#push and Array#unshift and keep in mind about the aliases!

push(obj, … ) => ary

Append — Pushes the given object(s) on to the end of this array. This expression returns the array itself, so several appends may be chained together. See also #pop for the opposite effect.

a = [ "a", "b", "c" ]
a.push("d", "e", "f")
        #=> ["a", "b", "c", "d", "e", "f"]
[1, 2, 3].push(4).push(5)
        #=> [1, 2, 3, 4, 5]

unshift(obj, …) => ary

Prepends objects to the front of self, moving other elements upwards. See also #shift for the opposite effect.

a = [ "b", "c", "d" ]
a.unshift("a")   #=> ["a", "b", "c", "d"]
a.unshift(1, 2)  #=> [ 1, 2, "a", "b", "c", "d"]

Active Support Core Extensions provide aliases Array#append and Array#prepend since Rails 3.2.0 (January 20, 2012). Since Ruby 2.5.0 Active Support Core Extensions prevent creating aliases Array#append and Array#prepend in favor of the implementation of them in Ruby [Pull Request #28638].

Active Support helps to bring new ideas/futures in the Ruby, it is one of the main reason to respect it.