不断发展的RubyCase语句-RubyCaseStatementthatkeepsprogressing

7  

Check below.

下面的检查。

print "Test a Color"
color = gets.chomp

hash = {
  '{W}' => 'White',
  '{R}' => 'Red'
}

# finding by regex and replace with what you want.
puts color.gsub(/\{.+?\}/){|k| hash[k] || k }

2  

colors = {
  'W' => 'White',
  'R' => 'Red',
  'G' => 'Green',
  'U' => 'Blue',
  'B' => 'Black',
}

input.scan(/{(\w)}/).each { |abbreviation| puts colors[*abbreviation] }

2  

Caveat

The following isn't the most efficient or idiomatic solution. However, it addresses your problem by making some simple improvements to your existing code while preserving your current semantics.

下面的方法不是最有效的或惯用的方法。但是，它通过对现有代码做一些简单的改进来解决您的问题，同时保留当前的语义。

Loop Over Your Case Statement

This solution reads standard input and converts it into an Array object stored in colors, and then loops over the case statement for each element of that array.

该解决方案读取标准输入并将其转换为以颜色存储的数组对象，然后循环遍历该数组的每个元素的case语句。

print "Test a Color: "
colors = gets.chomp.scan /\{[WRGUB]\}/
colors.each do |color|
  case color
  when "{W}"
    puts "White"
  when "{R}"
    puts "Red"
  when "{G}"
    puts "Green"
  when "{U}"
    puts "Blue"
  when "{B}"
    puts "Black"
  end
end

This will result in output similar to the following:

这将导致类似以下的输出:

$ ruby colors.rb 
Test a Color: {W}{B}
White
Black

1  

While @xdazz’ answer does the trick, it is not quite ruby idiomatic:

虽然@xdazz的回答很管用，但它并不完全是ruby惯用法:

hash = %w|W R G U B|.map { |e| "{#{e}}"}
                    .zip(%w|White Red Green Blue Black|)
                    .to_h

print "Test a Color"
# color = gets.chomp
color = "Hello, {W}, I am {B}!"
puts color.gsub(Regexp.union(hash.keys), hash)
#⇒ Hello, White, I am Black!

We use here String#gsub(pattern, hash).

我们在这里使用字符串#gsub(模式，散列)。