Creating a string from an array

I have an array of data pulling into a project containing a list of items. I want to place it in a text box and have been trying various methods to do this:

array list = ["apples","pears","oranges"]

I want this to display as such::

apples

pears

oranges

This below code works but obvious just lists them including columnns

window.cpAPIInterface.setVariableValue('outputvariable',list);

output - apples,pears,oranges

Several various codes work fine if I enter them in chrome console but will not work when included in advanced action javascript in an excercise:

resultstring = data['Items'].join("\n");

window.cpAPIInterface.setVariableValue('outputvariable',resultstring);

for (var i = 0; i < list.length; i++) {

    resultstring = resultstring + list + "\n";

}

window.cpAPIInterface.setVariableValue('outputvariable',resultstring);

and even a basic:

resultstring  = list[0] + "\n" + list[1] + "\n" + list[2];

window.cpAPIInterface.setVariableValue('outputvariable',resultstring);

ALL three of those work using the chrome console but will fail if used within captivate itself.

Any clues?