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2665. Counter II

Description

Write a function createCounter. It should accept an initial integer init. It should return an object with three functions.

The three functions are:

  • increment() increases the current value by 1 and then returns it.
  • decrement() reduces the current value by 1 and then returns it.
  • reset() sets the current value to init and then returns it.

 

Example 1:

 Input: init = 5, calls = ["increment","reset","decrement"] Output: [6,5,4] Explanation: const counter = createCounter(5); counter.increment(); // 6 counter.reset(); // 5 counter.decrement(); // 4

Example 2:

 Input: init = 0, calls = ["increment","increment","decrement","reset","reset"] Output: [1,2,1,0,0] Explanation: const counter = createCounter(0); counter.increment(); // 1 counter.increment(); // 2 counter.decrement(); // 1 counter.reset(); // 0 counter.reset(); // 0

 

Constraints:

  • -1000 <= init <= 1000
  • 0 <= calls.length <= 1000
  • calls[i] is one of "increment", "decrement" and "reset"

Solutions

  • type ReturnObj = { increment: () => number; decrement: () => number; reset: () => number; }; function createCounter(init: number): ReturnObj { let val = init; return { increment() { return ++val; }, decrement() { return --val; }, reset() { return (val = init); }, }; } /** * const counter = createCounter(5) * counter.increment(); // 6 * counter.reset(); // 5 * counter.decrement(); // 4 */

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