I present to you a horror from the depths, programming Ruby without the letter "e"

ruby_without_e.rb

c    = '' << 101
SUB  = /___/
subs = -> s { s.gsub(SUB, c) }
fn   = "/tmp/runs.rb"

# Patch it in for fun
`#{c}cho 'alias run #{subs['___val']}' > #{fn}`
load fn

mm = <<~ABC
  d___f m___thod_missing(m___th, *a, &f)
    c = '' << 101
    m___th_nam___ = m___th.to_s

    normal_nam___ = m___th_nam___.gsub(SUB) { c }

    if SUB.match?(m___th) && s___lf.r___spond_to?(normal_nam___)
      s___lf.s___nd(normal_nam___, *a, &f)
    ___ls___
      sup___r
    ___nd
  ___nd
ABC

run subs[mm]

p subs["s___l___ct"], [1,2,3].s___l___ct(&:"#{c}v#{c}n?")
p subs["r___duc___"], [1,2,3].r___duc___(0) { |a, i| a + i }

# ------- OUT -------

"select"
[2]
"reduce"
6