p886

### Keybase proof

I hereby claim:

  * I am p886 on github.
  * I am p886 (https://keybase.io/p886) on keybase.
  * I have a public key whose fingerprint is AB19 9923 F1B6 F633 4756  B21A 2DBF 53C2 E30E D27C

To claim this, I am signing this object:

p886

package main

import "fmt"

// Explanation:
// changeIt() takes as argument a pointer to a thing
// in line 14 we create such a pointer and pass it to changeIt().
// Hadn't we used a pointer but instead passed thing *normally*,
// we would not have been able to observe the change
// from "yolo" to "roflmao" in main

p886

def say(a_proc_obj)
  a_proc_obj.call
end

def tell
  yield
end

a_lambda = -> { puts "there you go" }

p886

# Anonymous Class for quickly building Fake Objects
# advantage over Struct: doesn't even need a single argument
# (Struct.new accepts 1+ arguments, this 0)

thing = Class.new do
  def name
    "helloooo!!"
  end
end.new # <-- immediately creating an instance of the anoymous class

p886

# this:
person = Struct.new(:name, :age, :human)

# …is functionally equivalent to this:
class Person
  attr_accessor :name, :age, :human
  def initialize name, age, human
    @name  = name
    @age   = age
    @human = human

p886

lamb = -> do
  a = 2
  b = 0
  puts "lamb #{b}"
  lamb = -> do
    puts a
    b += 1
    puts "lamb #{b}"
    lamb = -> do
      puts a