在Ruby中同时替换多个字符

Question

Are there a better way to wrote the same code below? I am looking for a clean and minimal code.

val.gsub!('A', 'Q')
val.gsub!('B', 'W')
val.gsub!('C', 'E')
val.gsub!('D', 'R')
val.gsub!('E', 'T')
val.gsub!('F', 'Y')

Answer 1

Use tr , it's purpose-built for the problem you're describing:

> val = "ASDFGHJKL"
=> "ASDFGHJKL"
> val.tr("ABCDEF", "QWERTY")
=> "QSRYGHJKL"

Without using any other methods than the ones you already know about, you could build a key/value mapping, and then iterate over the pairs:

{ 'A' => 'Q', 'B' => 'W', 'C' => 'E' ...}.each { |x,y| val.gsub(x, y) }