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One of the quickest ways to reorder your array is to reverse it that is, ip the order so that the last is rst and vice versa. To do this, use the reverse() method on your array:

1. According to Table 9.1, DTMF frequency tolerance for operation is 1.5 % and nonoperation is 3.5 %. Calculate the operation and nonoperation frequency boundaries of all eight frequencies.

var myArray:Array = [12,6,17,4,39]; myArray.reverse(); trace(myArray); //39,4,17,6,12

You were brie y introduced to functional programming in Iterating through the Items in an Array earlier. In this section you see other ways that you can treat an array as a collection of values that you apply functions to. You can replicate all these operations with looping code, but directly applying functions, tests, transformations, and lters to whole lists of data is a powerful, dare I say beautiful, technique. All these methods take functions as parameters with the same signature as the forEach() method shown earlier. There is one subtle difference: the every(), some(), and filter() methods require functions that return a Boolean rather than void.

Conditional Processing with every(), some(), and lter()

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The rst methods you ll learn about are designed to allow you to see what values of an array ful ll a certain condition. The every() method iterates over every element, applying the function passed into it until one of the elements causes the function to fail, returning false. The some() method

works the same way but, in its case, it stops when a value of true is reached. If the stopper value is reached, either method returns the last value processed. If the end of the array is reached without interruption, every() returns true (every value met the test) and some() returns false (none of the values met the test). Let s check out an example. Consider the array and ltering functions shown in Example 8-7.

fs 2. For N -point DFT, the frequency resolution is 2N = 8000 at 8000 Hz sampling rate. In Goertzel algorithm, the 2N k signal frequency f k is approximated by f s 2N . If N is not properly selected, the signal frequency f k may be off more than 1.5 % due to the DFT algorithm. By using the frequency operation tolerance 1.5 %, calculate N [180, 256] which makes all eight frequencies meet the requirement.

EXAMPLE 8-7

package { import com.actionscriptbible.Example; public class ch8ex7 extends Example { public function ch8ex7() { var myArray:Array = [1,2,3,4,5]; trace("---- is every value less than three "); trace(myArray.every(lessThanThree)); trace("---- are some of the values less than three "); trace(myArray.some(lessThanThree)); trace("---- are all values less than ten "); trace(myArray.every(lessThanTen)); trace("---- are some values more than ten "); trace(myArray.some(moreThanTen)); trace("---- which numbers are less than three "); trace(myArray.filter(lessThanThree)); } private function trace(elem); return (elem < } private function trace(elem); return (elem < } private function trace(elem); return (elem > } } } lessThanThree(elem:*, i:int, a:Array):Boolean { 3); lessThanTen(elem:*, i:int, a:Array):Boolean { 10); moreThanTen(elem:*, i:int, a:Array):Boolean { 10);

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reduce pdf file size in c#