Enable Javascript in your browser and then refresh this page, for a much enhanced experience.
string and dict<lambda> solution in Clear category for Letter Queue by xtofl
def letter_queue(commands):
q = ""
function = {
"PUSH": lambda q, tokens: q + tokens[1],
"POP": lambda q, _: q[1:] if q else ""
}
for cmd in commands:
tokens = cmd.split()
q = function[tokens[0]](q, tokens)
return q
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert letter_queue(["PUSH A", "POP", "POP", "PUSH Z", "PUSH D", "PUSH O", "POP", "PUSH T"]) == "DOT", "dot example"
assert letter_queue(["POP", "POP"]) == "", "Pop, Pop, empty"
assert letter_queue(["PUSH H", "PUSH I"]) == "HI", "Hi!"
assert letter_queue([]) == "", "Nothing"
Sept. 29, 2014
