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Day 5

cons(a, b) constructs a pair, and car(pair) and cdr(pair) returns the first and last element of that pair. For example, car(cons(3, 4)) returns 3, and cdr(cons(3, 4)) returns 4. Given this implementation of cons:

  def cons(a, b):
    def pair(f):
      return f(a, b)
    return pair

Implement car and cdr.

This problem was asked by Jane Street.

Solution | Tests