Ruby multiple string replacement

Question

str = \"Hello☺ World☹\"

Expected output is:

\"Hello:) World:(\"

I can do this: str.gsub(\"☺\", \":)\").gsu

Answer 1

You can also use tr to replace multiple characters in a string at once,

Eg., replace "h" to "m" and "l" to "t"

"hello".tr("hl", "mt")
 => "metto"

looks simple, neat and faster (not much difference though) than gsub

puts Benchmark.measure {"hello".tr("hl", "mt") }
  0.000000   0.000000   0.000000 (  0.000007)

puts Benchmark.measure{"hello".gsub(/[hl]/, 'h' => 'm', 'l' => 't') }
  0.000000   0.000000   0.000000 (  0.000021)