mrubyedge 2.1.2

mruby/edge is yet another mruby that is specialized for running on WASM
Documentation 
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##
# Enumerable ISO Test

assert('Enumerable', '15.3.2') do
  assert_equal(Module, Enumerable.class)
end

assert('Enumerable#all?', '15.3.2.2.1') do
  assert_true([1,2,3].all?)
  assert_false([1,false,3].all?)

  a = [2,4,6]
  all = a.all? do |e|
    e % 2 == 0
  end
  assert_true(all)

  a = [2,4,7]
  all = a.all? do |e|
    e % 2 == 0
  end
  assert_false(all)
end

assert('Enumerable#any?', '15.3.2.2.2') do
  assert_true([false,true,false].any?)
  assert_false([false,false,false].any?)

  a = [1,3,6]
  any = a.any? do |e|
    e % 2 == 0
  end
  assert_true(any)

  a = [1,3,5]
  any = a.any? do |e|
    e % 2 == 0
  end
  assert_false(any)
end

assert('Enumerable#collect', '15.3.2.2.3') do
  assert_true [1,2,3].collect { |i| i + i } == [2,4,6]
end

assert('Enumerable#detect', '15.3.2.2.4') do
  assert_equal 1, [1,2,3].detect() { true }
  assert_equal 'a', [1,2,3].detect(->{"a"}) { false }
end

assert('Array#each_with_index', '15.3.2.2.5') do
  a = nil
  b = nil

  [1].each_with_index {|e,i| a = e; b = i}

  assert_equal(1, a)
  assert_equal(0, b)
end

assert('Enumerable#entries', '15.3.2.2.6') do
  assert_equal([1], [1].entries)
end

assert('Enumerable#find', '15.3.2.2.7') do
  assert_equal 1, [1,2,3].find() { true }
  assert_equal 'a', [1,2,3].find(->{"a"}) { false }
end

assert('Enumerable#find_all', '15.3.2.2.8') do
  assert_equal [2,4,6,8], [1,2,3,4,5,6,7,8,9].find_all() {|i| i%2 == 0}
end

assert('Enumerable#grep', '15.3.2.2.9') do
  assert_equal [4,5,6], [1,2,3,4,5,6,7,8,9].grep(4..6)
end

assert('Enumerable#include?', '15.3.2.2.10') do
  assert_true [1,2,3,4,5,6,7,8,9].include?(5)
  assert_false [1,2,3,4,5,6,7,8,9].include?(0)
end

assert('Enumerable#include? takes an element for equal to itself') do
  # CRuby compares an element with `rb_equal()`, which answers for an object
  # and itself before it asks `==`; the walk made in Ruby compares through
  # `Array#__svalue_eq`, which answers what `mrb_equal()` answers in C and
  # hands a `==` written in Ruby back to be sent here.
  never = Class.new { def ==(other); false; end }.new
  always = Class.new { def ==(other); true; end }.new
  e = Class.new do
    include Enumerable
    define_method(:each) {|&b| b.call(never); b.call(always) }
  end.new
  assert_true e.include?(never)
  assert_true e.include?(Object.new)
  assert_false Class.new {
    include Enumerable
    define_method(:each) {|&b| b.call(never) }
  }.new.include?(Object.new)
end

assert('Enumerable#inject', '15.3.2.2.11') do
  assert_equal 21, [1,2,3,4,5,6].inject() {|s, n| s + n}
  assert_equal 22, [1,2,3,4,5,6].inject(1) {|s, n| s + n}
end

assert('Enumerable#map', '15.3.2.2.12') do
  assert_equal [2,4,6], [1,2,3].map { |i| i + i }
end

assert('Enumerable#max', '15.3.2.2.13') do
  a = ['aaa', 'bb', 'c']
  assert_equal 'c', a.max
  assert_equal 'aaa', a.max {|i1,i2| i1.length <=> i2.length}
end

assert('Enumerable#min', '15.3.2.2.14') do
  a = ['aaa', 'bb', 'c']
  assert_equal 'aaa', a.min
  assert_equal 'c', a.min {|i1,i2| i1.length <=> i2.length}
end

assert('Enumerable#member?', '15.3.2.2.15') do
  assert_true [1,2,3,4,5,6,7,8,9].member?(5)
  assert_false [1,2,3,4,5,6,7,8,9].member?(0)
end

assert('Enumerable#partition', '15.3.2.2.16') do
  partition = [0,1,2,3,4,5,6,7,8,9].partition do |i|
    i % 2 == 0
  end
  assert_equal [[0,2,4,6,8], [1,3,5,7,9]], partition
end

assert('Enumerable#reject', '15.3.2.2.17') do
  reject = [0,1,2,3,4,5,6,7,8,9].reject do |i|
    i % 2 == 0
  end
  assert_equal [1,3,5,7,9], reject
end

assert('Enumerable#select', '15.3.2.2.18') do
  assert_equal [2,4,6,8], [1,2,3,4,5,6,7,8,9].select() {|i| i%2 == 0}
end

assert('Enumerable#sort', '15.3.2.2.19') do
  assert_equal [1,2,3,4,6,7], [7,3,1,2,6,4].sort
  assert_equal [7,6,4,3,2,1], [7,3,1,2,6,4].sort {|e1,e2|e2<=>e1}
end

assert('Enumerable#to_a', '15.3.2.2.20') do
  assert_equal [1], [1].to_a
end

assert('Enumerable#max, #min - a comparison with no answer') do
  # `<=>` answers nil where the two stand in no order, and the loop would
  # otherwise ask that nil whether it is positive. A NaN is the numeric case;
  # a block answering nil is the other way to reach it.
  assert_raise(ArgumentError) { [1, 2].max { |a, b| nil } }
  assert_raise(ArgumentError) { [1, 2].min { |a, b| nil } }

  if Object.const_defined?(:Float)
    nan = Float::NAN
    assert_raise(ArgumentError) { [1.0, nan, 2.0].max }
    assert_raise(ArgumentError) { [1.0, nan, 2.0].min }
    assert_raise(ArgumentError) { [1, nan].max }
  end

  # A pair of different kinds stands in no order either.
  assert_raise(ArgumentError) { [1, 'a'].max }
  assert_raise(ArgumentError) { [1, 'a'].min }

  # An ordering that holds is left alone.
  assert_equal 3, [3, 1, 2].max
  assert_equal 1, [3, 1, 2].min
  assert_equal 3, [3, 1, 2].max { |a, b| a <=> b }
  assert_equal 1, [3, 1, 2].min { |a, b| a <=> b }

  # The first element is never compared, and an empty collection has none.
  assert_equal 'a', ['a'].max
  assert_equal 'a', ['a'].min
  assert_nil [].max
  assert_nil [].min
end