How good you at debug?

// test-1.js

let array = [0];

if(array != false) {
  if(array[0]) {
    array.push(1, 2, 3, 4);
  } else {
    array.splice(1, 2, 3, 4);
  }
} else {
  array = array + [937, 99, 92];
}

console.log(array);

// test-2.js

let array = [null];
if(array == 0) {
  array.push(0.1 + 0.2);
} else {
  array.length = 0;
  array.push(1, 2, 3);
}
console.log(array);

// test-3.js

let a = new Number('43');
if(a == 43) {
  if(a < Math.min()) {
    console.log(`${typeof a} is {} in js`);
  } else {
    console.log(`${a + '2'} == 432`);
  }
} else {
  console.log(`1 == 1 // => ${a instanceof Object}`);
} 

# test-4.rb

LETTERS = ['a', 'U', 'b', 'd', 'Z']
first = LETTERS.min
last = LETTERS.max(1)
if last.class == String
  last = "B"
else
  last = last[0].upcase
end

puts "We known R#{first}#{last}Y!"

# test-5.rb

begin
  first = [1, 2, 3, 4, 5].slice(-2.50, 1)
  if first.is_a?(Numeric)
    result = first / Float::INFINITY
    puts "#{result} is #{result.class}"
  else
    chars = first.map(&:to_s) + ['A', '0']
    puts "#{chars.min}..#{chars.max}"
  end
rescue => exception
  puts "It was easy"
end

# test-6.rb

words = "Norway=Egypt>Denmark".split(/(=|>)/)
if words.length == 3
  puts words.map(&:upcase).join(?&)
else
  puts words.sort_by(&:size).map{|w| w[0].upcase }.join
end

Enjoy beer

don't waste time on debug