2666. Allow One Function Call
Description
Given a function fn
, return a new function that is identical to the original function except that it ensures fn
is called at most once.
- The first time the returned function is called, it should return the same result as
fn
. - Every subsequent time it is called, it should return
undefined
.
Example 1:
Input: fn = (a,b,c) => (a + b + c), calls = [[1,2,3],[2,3,6]] Output: [{"calls":1,"value":6}] Explanation: const onceFn = once(fn); onceFn(1, 2, 3); // 6 onceFn(2, 3, 6); // undefined, fn was not called
Example 2:
Input: fn = (a,b,c) => (a * b * c), calls = [[5,7,4],[2,3,6],[4,6,8]] Output: [{"calls":1,"value":140}] Explanation: const onceFn = once(fn); onceFn(5, 7, 4); // 140 onceFn(2, 3, 6); // undefined, fn was not called onceFn(4, 6, 8); // undefined, fn was not called
Constraints:
calls
is a valid JSON array1 <= calls.length <= 10
1 <= calls[i].length <= 100
2 <= JSON.stringify(calls).length <= 1000
Solutions
Solution 1
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