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配列の先頭、末尾に追加する

Posted at 2022-09-10

配列の最初に追加する

配列.unshift(その配列の先頭に追加する要素)

irb(main):022:0> a = []
=> []
irb(main):023:0> a.unshift("a","b")
=> ["a", "b"]
irb(main):024:0> a.unshift("c","d")
=> ["c", "d", "a", "b"]

配列.push(その配列の末尾に追加する要素)

irb(main):025:0> a.push("e","f")
=> ["c", "d", "a", "b", "e", "f"]

これ使おう。