What are the methods to trace an array to the following criteria? - arrays

Question

The array:
var numberArray:Array= new Array(34,53,2,3,34,26,26,85,3,4,98,2,12);
How do I trace it so the output-panel will show every other item: "34,2,34,26,3,98,12"
How do I trace the numbers that have a lower value than 10
How do I trace the even numbers in the array?

Answer 1

For the reference and general education: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/Vector.html#map()
// You can init Arrays with [] operator.
var numberArray:Array = [34,53,2,3,34,26,26,85,3,4,98,2,12];
trace(filter(numberArray, evenIndices));
trace(filter(numberArray, belowTen));
trace(filter(numberArray, evenValues));
// In AS3 you can pass method references as function arguments.
// That allows to compose a filtering method, just like Vector.map(...)
// This method will filter the original array
// by the given criteria and return the filtered result.
// Criteria method must accept 2 arguments: element index and value.
function filter(source:Array, criteria:Function):Array
{
var result:Array = new Array;
for (var i:int = 0; i < source.length; i++)
if (criteria(i, source[i]))
result.push(source[i]);
return result;
}
// Returns true if index is an even number.
function evenIndices(index:int, value:int):Boolean
{
return index % 2 == 0;
}
// Returns true if value is less than 10.
function belowTen(index:int, value:int):Boolean
{
return value < 10;
}
// Returns true if value is an even number.
function evenValues(index:int, value:int):Boolean
{
return value % 2 == 0;
}

Answer 2

var numberArray:Array = [34, 53, 2, 3, 34, 26, 26, 85];
1.How do I trace it so the output-panel will show every-other item: "34,2,34,26,3,98,12"
getEventIndexiesOfArray(numberArray);
2.How do I trace the numbers that have a lower value than 10
lenghtLessthanTen(numberArray);
3.How do I trace the even numbers in the array?
checkArrayHasEventLenght(numberArray);
1. getEventIndexiesOfArray() method for get event indexies elements from array.
private function getEventIndexiesOfArray(source:Array):void
{
var resultArr:Array = [];
for (var i:int = 0; i < source.length; i++)
{
if (i % 2 == 0)
resultArr.push(source[i]);
}
trace("Even Indexies Array : " + resultArr.toString());
}
2. lenghtLessthanTen() method for check that array lenght is lessthan 10 or not.
private function lenghtLessthanTen(source:Array):void
{
if (source.length < 10)
trace("Array containt lessthan Ten elements");
}
3. checkArrayHasEventLenght() method check that array containt even lenght or not.
private function checkArrayHasEventLenght(source:Array):void
{
if (source.length % 2 == 0)
trace("Array has even number of elenter code hereements");
}