小编Sea*_*ino的帖子

我是Ruby的新手,我正在尝试将键/值对"注入"Ruby中的现有哈希.我知道你可以使用<< for arrays,例如

arr1 = []
a << "hello"

但我可以为哈希做类似的事情吗？所以像

hash1 = {}
hash1 << {"a" => 1, "b" => 2}

基本上,我正在尝试基于条件的循环中的键值对.

# Encoder: This shifts each letter forward by 4 letters and stores it  in a hash called cipher. On reaching the end, it loops back to the first letter
def encoder (shift_by)
alphabet = []
cipher = {}
alphabet =  ("a".."z").to_a
alphabet.each_index do |x|
        if (x+shift_by) <= 25
            cipher = {alphabet[x] => alphabet[x+shift_by]}
        else
            cipher = {alphabet[x] => …

我试图each_with_index在数组上实现该方法.

def display_weapons
  puts "Your current list of weapons are: "
  @weapons.each_with_index do |weapon, index|
    puts "#{index + 1}. #{weapon}"
  end
end

我称之为:

@weapons = ["Rockets", "Laser", "Photon blaster", "Plasma cannon"]
puts display_weapons

我得到了结果:

Your current list of weapons are: 
1. Rockets
2. Laser
3. Photon blaster
4. Plasma cannon
Rockets
Laser
Photon blaster
Plasma cannon

我没有得到我想的那样.我只是想问一下这种方法是如何工作的.为什么我要两次获得元素？一旦指数+ 1,一次没有.