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Counter2.ts
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Counter2.ts
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/**
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
**/
type Counter = {
increment: () => number,
decrement: () => number,
reset: () => number,
}
function createCounter(init: number): Counter {
const notChange = init;
return {
increment: () => {
return ++init;
},
decrement: () => {
return --init;
},
reset: () => {
init = notChange
return init;
}
}
};
/**
* const counter = createCounter(5)
* counter.increment(); // 6
* counter.reset(); // 5
* counter.decrement(); // 4
*/