docs:programming:javascript:arrays [hartungdesign.net wiki]

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====== Arrays ======

===== Simple Array =====
  * you do not have to declare a fixed size for an array when you create it
  * if you do specify a size, the values are NULL until they are set

<code javascript>
var myArray = new Array();
myArray[0] = "Alice";
myArray[1] = "Fred";
...
</code>

  * if you supply more than one argument to Array(), the values are treated as data for the array
<code javascript>
var myArray = new Array("Alice", "Fred", "Jean");

// or

var myArray = ["Alice", "Fred", "Jean"];
</code>

===== Dynamically populating an array =====
  * use the .length property to determine the number of items, which is the same as the next available index since arrays are 0 based:
<code javascript>
myArray[myArray.length] = "Steve";
</code>

===== Multidimensional Arrays =====
FIXME

===== Strings and Arrays =====
  * use join to create a string of all array items:<code javascript>
var arrayAsString = myArray.join(","); // a comma is inserted between each item
</code>
  * use split to create an array of items from a string:<code javascript>
var restoredArray = myRegularString.split(",");
</code>
  * split is more powerful, because regular expressions can be used as the separator parameter; the following creates an array of just the integer portions of values, looking for a period followed by two numerals and an optional comma:<code javascript>
var amounts = "30.25,120.00,45.09,200.10";
var amtArray = amounts.split(/\.\d{2},?/);
</code>

===== Sorting an array =====
FIXME

===== Dividing an array =====
FIXME

===== Combining arrays =====
FIXME