Java Virtal Machine.net

[ News ] rss

February 01, 2011

Mark Wielaard: New GPG key. Finally created a new GPG key using gnupg. The old one was a DSA/1024 bits one and 8 years old. The new one is a RSA/2048 bits one. I will use the new one in the future to sign any release tarballs I might create. pub 2048R/57816A6A 2011-01-29 Key f...

More »

February 01, 2011

Andrew Hughes: [SECURITY] IcedTea6 1.7.8, 1.8.5, 1.9.5 Released!. We are pleased to announce a new set of security releases, IcedTea6 1.7.8, IcedTea6 1.8.5 and IcedTea6 1.9.5. This update contains the following security updates: The IcedTea project provides a harness to build the source code from OpenJDK6 u...

More »

November/2017
SunMonTueWedThuFriSat
   1234
567891011
12131415161718
19 202122232425
2627282930  

[ Archives News
for 'Developers' ]

home > news > developers > javascript type inference in netbeans

JavaScript Type Inference in NetBeans

Roman Strobl has just published a screencast of the new JavaScript editor in NetBeans 6.1. The demo is around 5 minutes and highlights many of the editing features. I'd like to dwell on the type inference part a bit. Around four minutes into the demo, Roman shows that NetBeans figures out the types of expressions, including those involving function calls. In his example, all the types happened to be Strings so it may look like a lucky coincidence. It's not! Here's some code fragments showing in more detail what's going on. Let's start with a jQuery expression in an HTML file - in my last entry I showed how code completion already helps you fill in the strings inside the jQuery dollar function. NetBeans knows the return type of the dollar function so we're only presented with jQuery methods here: jQuery methods return the jQuery object itself as the return value, so we can chain calls into jQuery. We'll do that here by calling a function on the return value from addClass: As you can see, when NetBeans knows the return type of a function, it's shown in code completion item separated by a colon. Here I want to call the queue() method which returns an array of functions. Let's see what happens if we just call functions on the result object: As you can see - we're getting methods on the Array class, since we're getting an array back. Let's pick a specific element in the array instead, and see what code completion g...


Date: April, 29 2008
Url: http://blogs.sun.com/tor/entry/javascript_type_inference


Others News

©2002-2017Java-Virtual-Machine.net it | mobiriseextensions.com | bootstrap popup window | free icon maker | css slider