Howto:Coding a simple Nasal Framework: Difference between revisions

Howto:Coding a simple Nasal Framework (view source)

1,083 bytes added , 26 February 2014

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@@ Line 79: / Line 79: @@
    append(PFDVector, PrimaryFlightDisplay.new() );
 </syntaxhighlight>
+== Initialization / Constructor ==
+Once these changes are in place, you can easily initialize your members/fields using a single foreach() loop, i.e. instead of having something like this:
+<syntaxhighlight lang="nasal">
+curAlt1 = pfd.getElementById("curAlt1");
+curAlt2 = pfd.getElementById("curAlt2");
+curAlt3 = pfd.getElementById("curAlt3");
+vsPointer = pfd.getElementById("vsPointer");
+curAltBox = pfd.getElementById("curAltBox");
+curSpd = pfd.getElementById("curSpd");
+curSpdTen = pfd.getElementById("curSpdTen");
+spdTrend = pfd.getElementById("spdTrend");
+</syntaxhighlight>
+You could use this
+<syntaxhighlight lang="nasal">
+var PrimaryFlightDisplay {
+ new: func() {
+ var m = {parents:[PrimaryFlightDisplay]};
+ m.symbols = {};
+ foreach(var symbol; ['curAlt1','curAlt2','curAlt3','vsPointer','curAltBox','curSpd','curSpdTen','curAlt1','spdTrend',])
+  me.symbols[symbol] = me.getElementById(symbol);
+}, # new()
+} # PrimaryFlightDisplay
+</syntaxhighlight>
+All the original foo=nil initialization can now be removed, this is 100% equivalent, and saves you tons of typing and time!
 == Dealing with Properties ==
@@ Line 101: / Line 129: @@
 This would then be the place for your instance-specific properties.
 == Configuration ==