When comparing CFML vs Xtend, the Slant community recommends Xtend for most people. In the question“What is the best programming language to learn first?” Xtend is ranked 68th while CFML is ranked 73rd. The most important reason people chose Xtend is:
Lambdas are written like Smalltalk's blocks. If it's the last argument, it can go after the parentheses like Ruby's blocks. Parentheses on method calls are optional.
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Pros

Pro Rapid application development
Get a web app up and running fast with stuff built right in to CFML! Frameworks make it even faster but lengthen the learning curve.

Pro Easily query a database
Newcomers can use an html-like syntax to query a database. Advanced developers can use a scripted syntax to execute stored procedures.
Pro Multiple engine implementations available
There are multiple engine implementations available including Adobe ColdFusion, Lucee, New Atlanta BlueDragon, Railo, and Open BlueDragon among others.
Pro Quick document and image manupulation
ColdFusion can quickly interact with PDFs , Spreadsheets to read/manipulate the data. There are a lot of built in functions to manipulate images quickly.
Pro Ruby-like syntactic conveniences
Lambdas are written like Smalltalk's blocks. If it's the last argument, it can go after the parentheses like Ruby's blocks. Parentheses on method calls are optional.
Pro Type inference
It uses Java's static type system, but you don't have to declare the type of everything all the time, since the Xtend compiler can usually figure it out. This also dramatically cuts down on Java's infamous verbosity.
Pro Code runs just as fast as Java
Because Xtend relies heavily on JDK and Android classes, it runs just as fast as native Java code.
Pro Easy to switch back to Java
Xtend is a low-risk option. Because it compiles to human-readable Java, if you decide you don't like it for your project, you can just switch back to Java without losing your work.
Pro Extend even library classes with new methods
This is where it gets its name. You can open classes and add new methods, kind of like Ruby. (Of course this has to be compiled to Java, so really it lives in a kind of helper class.)
Pro Succint
Uses functional features ,which are very concise and idiomatic. Plus it has annotations, which cuts down on the Java boilerplate.
Pro Better defaults than Java
Methods are public if you don't specify, and fields are private. Locals declared with val
in Xtend are final
in Java. This dramatically cuts down on Java's infamous verbosity.
Cons
Con Little actual use either in academia or professionally
Con Difficult to configure in Android Studio
Con Slower compilation
Unlike most JVM languages, Xtend compiles to Java rather than directly to JVM bytecode. So you have to compile everything four times for Android: from Xtend to Java, from Java to JVM bytecode (.class files), from .class to .dex bytecode, and then AOT compilation from .dex to native ARM upon installation. This can really slow down development and testing vs a more interactive language like Clojure.
