7-boom test function.

seven_boom.js

sevenBoom = function(n) {
  return xBoom(n, 7);
}
 
xBoom = function(n, boom) {
  return dividedBy(n, boom) || containsDigit(n, boom);
}
 
dividedBy = function(n, x) {
  return n % x == 0;
}
 
containsDigit = function(n, x) {
  return n.toString().indexOf(x.toString()) >= 0;
}

seven_boom.rb

def seven_boom(n)
  x_boom(n, 7)
end

def x_boom(n, boom)
  divided_by(n, boom) or contains_digit(n, boom)
end

def divided_by(n, x)
  n % x == 0
end

def contains_digit(n, x)
  n.to_s.include?(x.to_s)
end