Script used to generate this https://jsperf.com/switch-vs-hash/48

jsperf.switch-hash.rb

MAX = 1500

def stringfy(number)
  text = ''

  begin
    remainder = number % 26
    text += (remainder + 'a'.ord).chr
    number = number / 26
  end while number > 0

  text
end

def preparation
  puts "<script>
  var theVar = 'sfc';

  var cases = [];"

  (0..MAX).each { |i| puts "  cases['#{stringfy i}'] = function() {};" }

  puts "</script>"
end

def eachgen
  puts "switch (theVar) {"

  (0..MAX).each do |i|
    i = stringfy i
    puts "case '#{i}':"
    puts "  cases['#{i}']();"
    puts "  break;"
  end

  puts "default:"
  puts "}"
end

def ifelse
  puts "if (theVar === 'a') {"
  puts " cases['a']()"
  print "}"

  (1..MAX).each do |i|
    i = stringfy i
    print " else if (theVar === '#{i}') {\n"
    puts "  cases['#{i}']();"
    print "} "
  end

  puts "else {}"
end