Return Length of Arguments Passed - Practice Coding Problems

Return Length of Arguments Passed - Problem

JavaScript Easy

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

The function should work with any number of arguments of any type and return the total count as an integer.

Note: This problem focuses on JavaScript's function parameter handling and the arguments object or rest parameters.

Input & Output

Example 1 — Multiple Arguments

$ Input: args = [5, "hello", true]

› Output: 3

💡 Note: The function receives 3 arguments: a number (5), a string ("hello"), and a boolean (true), so it returns 3

Example 2 — Single Argument

$ Input: args = [42]

› Output: 1

💡 Note: Only one argument is passed to the function, so the count is 1

Example 3 — No Arguments

$ Input: args = []

› Output: 0

💡 Note: No arguments are passed to the function, so the count is 0

Constraints

0 ≤ arguments.length ≤ 100
Arguments can be of any JavaScript type

Visualization

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Understanding the Visualization

Input

Function called with various arguments

Process

Count the number of arguments

Output

Return the count as integer

Key Takeaway

🎯 Key Insight: JavaScript automatically tracks argument count - just access the length property

Asked in

G Google 15 f Facebook 12 a Amazon 8

Brief HTML summary: The key insight is that JavaScript automatically tracks the number of arguments passed to a function. Best approach is using rest parameters with ES6 syntax. Time: O(1), Space: O(1)

Common Approaches

Approach	Time	Space	Notes
✓ Rest Parameters Method	O(1)	O(1)	Use modern ES6 rest parameters to capture all arguments
Arguments Object Method	O(1)	O(1)	Use the legacy arguments object to count parameters

Rest Parameters Method — Algorithm Steps

Step 1: Use rest parameter syntax (...args)
Step 2: Return args.length

Visualization

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Step-by-Step Walkthrough

Function Definition

function(...args) syntax

Arguments Collection

All arguments collected into array

Length

Return array length

Code -

solution.c — C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int solution(int* args, int size) {
    return size;
}

int main() {
    char line[1000];
    fgets(line, sizeof(line), stdin);
    line[strcspn(line, "\n")] = 0;
    
    int count = 0;
    int args[100];
    
    if (strlen(line) > 2) { // More than just "[]"
        char* token = strtok(line + 1, ",]");
        while (token != NULL) {
            args[count++] = atoi(token);
            token = strtok(NULL, ",]");
        }
    }
    
    printf("%d\n", solution(args, count));
    return 0;
}

Time & Space Complexity

Time Complexity

⏱️

O(1)

Array length property access is constant time

✓ Linear Growth

Space Complexity

O(1)

No additional space beyond the parameter array

✓ Linear Space

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Input & Output

Constraints

Visualization

Related Problems

Common Approaches

Rest Parameters Method — Algorithm Steps

Visualization

Code -

Time & Space Complexity

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