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Return Length of Arguments Passed

EasyUpdated: Aug 2, 2025
Practice on:
LeetCode

Problem

Write a function argumentsLength that returns the count of arguments passed to it.

Examples

Example 1

Input: args = [5]
Output: 1
Explanation:
argumentsLength(5); // 1

One value was passed to the function so it should return 1.

Example 2

Input: args = [{}, null, "3"]
Output: 3
Explanation: 
argumentsLength({}, null, "3"); // 3

Three values were passed to the function so it should return 3.

Constraints

  • args is a valid JSON array
  • 0 <= args.length <= 100

Solution

Method 1 - Rest Parameters

Intuition

JavaScript and TypeScript allow us to use rest parameters to capture all arguments as an array, whose length is the answer.

Approach

Define the function with ...args and return args.length.

Code

JavaScript
function argumentsLength(...args) {
    return args.length;
}
TypeScript
function argumentsLength(...args: any[]): number {
    return args.length;
}

Complexity

  • ⏰ Time complexity: O(1) — just returns the array length.
  • 🧺 Space complexity: O(1) — no extra space used.

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