of the args are passed as separate arguments to fn, which returns -10 (5 + 5 - 20).

Constraints:

fn is a function
args and restArgs are valid JSON arrays
1 <= args.length <= 5 * 10^4
1 <= restArgs.length <= 5 * 10^4
0 <= number of placeholders <= restArgs.length

Solution

Method 1 – Simulate Placeholder Replacement

Intuition

We want to create a partial function where placeholders ("_") in the initial argument list are replaced by values from the next call. Any extra values are appended at the end. This is a direct simulation of the described process.

Approach

Return a function that takes ...restArgs.
Iterate through

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