[Easy] LeetCode JS 30 - 2703. Return Length of Arguments Passed

Question Prompt

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

// 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.

Solutions

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To solve this problem, we need to first understand the three dots (...) in the function definition of argumentsLength(...args). This is called a "rest parameter." This feature allows a function to accept an indefinite number of arguments and gathers them into an array named args.

Inside the argumentsLength function, we simply return args.length. The length property of an array provides the number of elements in the array. In this case, args holds all the arguments passed to the function.

function argumentsLength(...args) {
  return args.length;
}