Design a Timer App | Dataford Interview Questions

Design a timer app.

Implement a countdown timer simulator that processes commands in order and reports the remaining seconds after every command. The timer supports START n, PAUSE, RESUME, TICK n, and RESET. START n sets the remaining time to n and starts the timer. Ticks affect the timer only while running; reaching zero stops it. Commands issued in an inapplicable state are no-ops.

Function signature: timer_states(commands). Return a list of remaining times, one value after each command.

Constraints

1 <= commands.length <= 1000
Each command is one of START n, PAUSE, RESUME, TICK n, or RESET
0 <= n <= 10^9
START and TICK always include a nonnegative integer
Return one output value for every input command

Function Signature

def timer_states(commands):

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Problem

Design a timer app.

Function signature: timer_states(commands). Return a list of remaining times, one value after each command.

Constraints

1 <= commands.length <= 1000
Each command is one of START n, PAUSE, RESUME, TICK n, or RESET
0 <= n <= 10^9
START and TICK always include a nonnegative integer
Return one output value for every input command

Function Signature

def timer_states(commands):

Your question is Design a Timer App. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.