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LeetCode problem#2703

Return Length of Arguments Passed

Solved in 1 languageJavaScript

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Solution

11 lines
1/**
2 * @param {...(null|boolean|number|string|Array|Object)} args
3 * @return {number}
4 */
5var argumentsLength = function(...args) {
6  return args.length;
7};
8
9/**
10* argumentsLength(1, 2, 3); // 3
11*/

How it works

The provided code is a solution to a LeetCode problem that requires counting the number of arguments passed to a function. Let me break down the code step-by-step:

Code Explanation

  1. Function Declaration:

    var argumentsLength = function(...args) {
    • This line declares a function named argumentsLength, which takes a variable number of arguments thanks to the "rest parameter" syntax (...args).
    • The ...args syntax collects all the arguments passed to the function into an array named args.

  2. Returning the Length:

    return args.length;
    • The second line of the function returns the length of the args array.
    • The length property of an array returns the number of elements in that array, which corresponds to the number of arguments passed to the function.

  3. Example Call:

    argumentsLength(1, 2, 3); // 3
    • This line is an example of how to call the argumentsLength function. It passes three arguments: 1, 2, and 3.
    • Since the function collects all arguments into the args array, in this case, args will be [1, 2, 3], and args.length will be 3, hence the function will return 3.

Key Points

  • Rest Parameters: The ...args in the function signature allows the function to accept any number of parameters. All passed parameters are aggregated into a single array called args.

  • Array Length: The length property of the array is a simple and efficient way to determine how many arguments were provided when the function was called.

Conclusion

The given solution is concise and effective for counting the number of arguments passed to the argumentsLength function. It leverages JavaScript's rest parameters and array length property to achieve the desired functionality efficiently.

Written by AI from the code above, so double-check anything important.

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