2797. Partial Function with Placeholders π
Description
Given a function fn
and an array args
, return a function partialFn
.
Placeholders "_"
in the args
should be replaced with values from restArgs
starting from index 0
. Any remaining values in the restArgs
should be added at the end of the args
.
partialFn
should return a result of fn
. fn
should be called with the elements of the modified args
passed as separate arguments.
Example 1:
Input: fn = (...args) => args, args = [2,4,6], restArgs = [8,10] Output: [2,4,6,8,10] Explanation: const partialFn = partial(fn, args) const result = partialFn(...restArgs) console.log(result) // [2,4,6,8,10] There are no placeholders "_" in args therefore restArgs is just added at the end of args. Then the elements of the args are passed as separate arguments to fn, which returns passed arguments as an array.
Example 2:
Input: fn = (...args) => args, args = [1,2,"_",4,"_",6], restArgs = [3,5] Output: [1,2,3,4,5,6] Explanation: const partialFn = partial(fn, args) const result = partialFn(...restArgs) console.log(result) // [1,2,3,4,5,6] Placeholders "_" are replaced with values from the restArgs. Then the elements of the args are passed as separate arguments to fn, which returns passed arguments as an array.
Example 3:
Input: fn = (a, b, c) => b + a - c, args = ["_", 5], restArgs = [5, 20] Output: -10 Explanation: const partialFn = partial(fn, args) const result = partialFn(...restArgs) console.log(result) // -10 Placeholder "_" is replaced with 5 and 20 is added at the end of args. Then the elements of the args are passed as separate arguments to fn, which returns -10 (5 + 5 - 20).
Constraints:
fn
is a functionargs
andrestArgs
are valid JSON arrays1 <= args.length <= 5 * 104
1 <= restArgs.length <= 5 * 104
0 <= number of placeholders <= restArgs.length
Solutions
Solution 1
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