Passing an array as parameter in JavaScript

Question

I have an array, and I want to pass it as a parameter in a function such as:

function something(arrayP){     for(var i = 0; i < arrayP.length; i++){           alert(arrayP[i].value);     }  } 

I'm getting that arrayP[0] is undefined, which might be true as inside the function I never wrote what kind of array arrayP is. So,

1. Is is possible to pass arrays as parameters?
2. If so, which are the requirements inside the function?

Answer 1

Just remove the .value, like this:

function(arrayP){        for(var i = 0; i < arrayP.length; i++){       alert(arrayP[i]);    //no .value here    } } 

Sure you can pass an array, but to get the element at that position, use only arrayName[index], the .value would be getting the value property off an object at that position in the array - which for things like strings, numbers, etc doesn't exist. For example, "myString".value would also be undefined.

Answer 2

JavaScript is a dynamically typed language. This means that you never need to declare the type of a function argument (or any other variable). So, your code will work as long as arrayP is an array and contains elements with a value property.