javascript - Java Script Array SIMPLE -

hello new first question. completing javascript primer bloc, , stuck on simple checkpoint.

i trying create function named arraylengthplusone. function should: take 1 argument, array return number 1 greater number of elements in array.. example: arraylengthplusone([0,0,1,0,2,1]); // returns 7

code tried:

var arraylengthplusone = function () {   return arraylengthplusone.length + 1; };  

i getting error message telling me isnt' passing tests. maybe i'm not grasping array/function relationship. understand array object not data type. how make function take 1 argument, array ?

only need add argument in function declaration.

var arraylengthplusone = function(data) { // data argument in function. it's array.    return data.length + 1;  };    // calling function.  var arraydata = [0, 1, 3, 4]; // declare array variable 4 elements.  alert(arraylengthplusone(arraydata)); // show alert result. returns 4 + 1 elements.