True values

---

• false, nil, and the null pointer are "falsy" everything else, including 0 and "" are true

examples/intro/true_values.cr

values = [0, "0", "", 1, true, false, nil]
values.each { |val|
  if val
    puts "#{val} is true"
  else
    puts "#{val} is NOT true"
  end
}

0 is true
0 is true
 is true
1 is true
true is true
false is NOT true
 is NOT true