Debugging print p!

---

• p! can be useful, especially for debugging prints as it includes the name of the variable.
• Here we see a simple string printed and then a slightly more complex data-structure.

examples/intro/debugging_print.cr

name = "Foo"
person = {
  name:    "Foo",
  number:  42,
  yesno:   true,
  fruits:  ["apple", "banana", "peach"],
  address: {
    "street"  => "Main str.",
    "city"    => "Capital",
    "country" => "Country",
  },
}
puts name
p name
p! name
pp! name

puts ""

puts person
p person
p! person
pp! person

Foo
"Foo"
name # => "Foo"
name # => "Foo"

{name: "Foo", number: 42, yesno: true, fruits: ["apple", "banana", "peach"], address: {"street" => "Main str.", "city" => "Capital", "country" => "Country"}}
{name: "Foo", number: 42, yesno: true, fruits: ["apple", "banana", "peach"], address: {"street" => "Main str.", "city" => "Capital", "country" => "Country"}}
person # => {name: "Foo", number: 42, yesno: true, fruits: ["apple", "banana", "peach"], address: {"street" => "Main str.", "city" => "Capital", "country" => "Country"}}
person # => {name: "Foo",
 number: 42,
 yesno: true,
 fruits: ["apple", "banana", "peach"],
 address: 
  {"street" => "Main str.", "city" => "Capital", "country" => "Country"}}