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Figure 11 17. Sample NXT-G code for saving the state of a counter value Adding logic such as this to the master program would not require much effort. It might not be necessary to do so, but if you find yourself needing to save the state of your sequence, a process such as this will work well.

Bet you re glad now that JavaScript provides looping statements so that you don t have to write all those if conditions! Note that, in addition to saving programmers time, loops let JavaScript work smart. In our while loop, JavaScript knew it was not necessary to query the final three elements, since it had already found "Borpatra".

Figure 1-12. The output of Listing 1-19

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A break statement tells JavaScript to totally abort a loop. But what if you just want to abort an iteration but not the loop Is there anything less draconian than break It turns out there is. continue statements simply terminate an iteration. JavaScript then reevaluates the boolean expression to see whether it takes another roundabout. Typically, continue is used to abort an iteration when a variable contains an undesirable value such as undefined or "". Let s corrupt looseLeafTea by adding "" prior to "Kenilworth" and undefined prior to "Keemun" (by inserting two commas in a row). Then add an else if clause that runs whenever an element in looseLeafTea contains a falsy value. In there we will do two things. First, we will delete the

Summary

The last example for the grouping operator uses the comparer parameter, which allows us to customize the behavior of the Group By method during its work. See Listing 1-20.

falsy element from looseLeafTea by way of the predefined splice()method, which we will cover in more detail in 5, that just removes the element from the array and then brings the subsequent elements forward to fill the gap Second, we will insert a continue statement to abort the iteration This statement will halt the current iteration of the loop and jump back to the start of the while loop with a new iteration Note that this means we will skip the i ++ line of code, so the counter will not be incremented This is exactly what we want to happen because, when we removed the falsy element, JavaScript brought all the remaining elements forward to fill the gap, so there is a new element now occupying the position of the old falsy element.

Public Class MyComparer Implements IEqualityComparer(Of String) ' Methods Public Function Equals(ByVal x As String, ByVal y As String) As Boolean Implements System.Collections.Generic.IEqualityComparer(Of String).Equals Return (x.Substring(0, 2) = y.Substring(0, 2)) End Function Public Function GetHashCode(ByVal obj As String) As Integer Implements System.Collections.Generic.IEqualityComparer(Of String).GetHashCode Return obj.Substring(0, 2).GetHashCode End Function End Class Dim dictionary As String() = New String() _ {"F:Apple", "F:Banana", _ "T:House", "T:Phone", _ "F:Cherry", "T:Computer"} Dim comparerDelegate As New Func(Of String, String)(AddressOf comparer)

For that reason, we want to loop over the same index in the array twice to make sure we cover all the elements Finally, let s increment i within an else clause just to make things read better So, modify the previous sample like so, and click Run in Firebug: var looseLeafTea = [ "Ghillidary", "", "Kenilworth", "Milima", , "Keemun", "Boisahabi", "Manohari", "Borpatra", "Lukwah", "Khongea" ]; var mood = "glum"; var i = 0; while (i < looseLeafTealength) { if (looseLeafTea[i] === "Borpatra") { mood = "cheery"; break; } else if (! looseLeafTea[i]) { looseLeafTeasplice(i, 1); continue; } else { i ++; } } "I feel " + mood + "!"; // "I feel cheery!" Before moving on, let s check to make sure JavaScript did weed out the "" and undefined values from looseLeafTea.

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