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Extra info for Das JavaScript Codebook

Example text

In Zeile 5 weisen Sie gar dem 16. Datenfeldelementeintrag einen Wert zu, und damit ist das Datenfeld 16 Elemente groß (die Elemente a[6] bis a[15] sind einfach mit undefined belegt), was die Ausgabe belegt. Sie sieht so aus: 5 6 16 Listing 18: Die Ausgabe Das Verhalten ist noch extremer. length+"
"); Listing 19: Anlegen und Vergrößern eines Datenfelder – Teil 2 44 Einführung In dem zweiten Beispielcode legen Sie ein Datenfeld ohne Angabe der Größe an. Mit der Eigenschaft length fragen Sie wieder die Größe der Datenfelder ab.

Von der Logik her bedeutet dies, dass bei Funktionen (auch) das Ergebnis einer Operation von Bedeutung sein sollte, während die Operation einer Prozedur reiner Selbstzweck ist. JavaScript unterscheidet die beiden Techniken nicht und stellt damit natürlich auch kein extra Schlüsselwort für eine Funktion ohne Rückgabewert bereit. Eine Funktion kann, muss aber keinen Rückgabewert liefern oder zumindest als »ohne Rückgabewert« definiert werden. Überhaupt behandelt JavaScript Funktionen sehr locker.

Beispiel (die Anweisungen im if-Block werden ausgeführt, wenn a einen Wert größer als 4 hat – dann ergibt a < 5 den Wert false und ! (a < 5)) { ... } Tabelle 9: Die logischen Vergleichsoperatoren von JavaScript Der konditionale Operator Unter dem konditionalen beziehungsweise if-else-Operator versteht man die Kombination der beiden Zeichen Fragezeichen und Doppelpunkt ? :. Der Doppeloperator arbeitet mit drei Operanden. Die Operation benötigt einen Boole´schen Ausdruck vor dem Fragezeichen. Wenn er wahr liefert, wird der Wert vor dem Doppelpunkt zurückgegeben, ansonsten der Wert hinter dem Doppelpunkt.

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