Hackerrank DS Arrays in JS

One challenge I completed is the Hackerrank's Data Structure Arrays Challenge! The challenge is basically asking you to reverse an array of numbers. There are a few specifications to the challenge in order to properly solve the problem. My answer code is at the bottom of this post. This was the first challenge I solved on Hackerrank. I will analyze the code I have written and show the input and outputs from Hackerrank. The function reverseArray() has a parameter of the predeclared variable of a. function reverseArray(a). In order to add the working specifications of the integer, one is greater than or equal to n and greater than or equal to 1000. JavaScript has a reverse function in order to reverse the content inside the element. A sample input was 1 4 3 2. A reversed output would be 2 3 4 1. The hardest input was 6676 3216 4063 8373 423 586 8850 6762. My correct but long output was 6762 8850 586 423 8373 4063 3216 6676. This is the end of my analysis and accomplishment of my first Hackerrank challenge!

function reverseArray(a) {
    // Declare an array with numbers 1-10
    var n = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    // Add specifications to the problem
    1 <= n <= 1000;
    // Reverse the array element's order
    a.reverse();
    // Return the reversed array
    return a;
}