Q117- Code: Write a function to calculate sum of n arguments in JavaScript

You can create a function that calculates the sum of any number of arguments using the arguments object, rest parameters, or array methods.

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1️⃣ Using Rest Parameters (ES6)

function sum(...numbers) {
  return numbers.reduce((total, num) => total + num, 0);
}

// Example usage
console.log(sum(1, 2, 3, 4)); // 10
console.log(sum(5, 10, 15));  // 30

Explanation:

• ...numbers collects all arguments into an array
• reduce iterates over the array and sums the elements

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2️⃣ Using the arguments Object (ES5)

function sum() {
  let total = 0;
  for (let i = 0; i < arguments.length; i++) {
    total += arguments[i];
  }
  return total;
}

// Example usage
console.log(sum(1, 2, 3, 4)); // 10
console.log(sum(5, 10, 15));  // 30

Explanation:

• arguments is an array-like object containing all passed arguments
• Use a loop to sum all values

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3️⃣ Using apply with Math.sum Pattern

function sum() {
  return Array.prototype.reduce.call(arguments, (a, b) => a + b, 0);
}

console.log(sum(2, 4, 6)); // 12

• Converts arguments into an array using Array.prototype methods

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⚡ Key Points:

• Prefer rest parameters (...args) in modern JS
• Works with any number of arguments
• Handles 0 arguments gracefully (sum() → 0)