An array is an indexed collection.
Arrays are untyped collections
Always zero based
Arrays only have one dimension
Array of Arrays
Arrays do not have fixed upper bounds

An array can contain anything

var mycollection = ['a',10,/a/,{ } ];  
mycollection.length /number of items and not the last index position

var myArr = new Array() // ?? 


reducer function ?

var cellvalues = myRange.values.reduce(function (a,b) { return a.concat(b); } . [ ] ); 

var range = context.workbook.names.getItem("MyNamedRange").getRange(); 

range.values returns a 2D array
range.values.length // returns count of rows which is the first dimension
range.values[0].length // returns count of columns which the ?? Dimension

function add() { 
   var tempValue = 0;
   for (i=0; i < arguments.length; i++) {
      tempValue += arguments[i];
   return tempValue;

var myValue = add(1,2,3,4);

Associative Arrays

This type of array lets you access the items in an array using a string lookup value.

var assArray = []; 
assArray["one"] = "myvalue";
assArray["two"] = "myvalue2";

Adding Properties

It is possible to add properties to an array

myArray2.myproperty = "Text"; 

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