用新值替换数组中的每个值（Ruby）

Question

prefix = "!"    

commands = [
        "command_1",
        "command_2"]

commands.each do |command|
    command = prefix + command
end

这非常简单。我想更改字符串"command_1"＆amp; "command_2"至"!command_1"＆amp; "!command_2"。我该怎么做？

Answer 1

使用map

commands_with_prefix = commands.map { |command| prefix + command }

或map!就地更新数组

commands.map! { |command| prefix + command }

另一种方式，插值

commands.map! { |command| "#{prefix}#{command}" }