Groovy brownbag
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Slides for a brown-bag on the Groovy programming language. The talk was given on 11/7/2011.
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Groovy brownbag
- 2. WHY GROOVY IS SO AWESOME Chris Trevino
- 3. “Using a computer requires a fair amount of ritual and ceremony…The less you interact with your computer, the faster you can go. In other words, eliminating ceremony allows you to get to the essence of the problem.” Neal Ford – The Productive Programmer
- 4. About Groovy •Object-oriented •Dynamically Typed •Can use all Java libraries •Feels a lot like Java •Can be compiled or interpreted
- 6. Most Java is valid Groovy
- 7. Steps to Start Using Groovy 1) Install eclipse plugin 2) Add groovy nature 3) Rename .java file .groovy
- 16. You don’t use package protected anyway
- 17. You don’t use package protected anyway (@PackageScope annotation is available if you do)
- 21. Getters and Setters are Optional
- 22. Getters and Setters are Optional
- 23. Getters and Setters are Optional
- 24. get..() and set..() are Optional
- 37. Type Declarations are Optional
- 41. Streamlined Maps
- 42. Streamlined Maps
- 44. Safe Traversal
- 45. Elvis
- 62. G-Strings
- 63. Native Regex Support Match: ==~ Find: =~
- 64. Easy File I/O
- 65. Easy Markup
- 68. Categories / Extension Methods
- 69. Extension methods with metaClass
- 70. Type Renaming
- 71. Hella Dynamic
- 72. Hella Dynamic
Notes de l'éditeur
- Welcome!I am Chris, and we’re talking about Groovy * Wrote a groovy coral service * Wrote GroovyTrailsMy Goals * Not to cover all aspects of Groovy * Not to convince you to port all of our code * Amuse bouche into the language * Convince you that it’s a good complement to Java
- The paradox of productivity.
- * You can incorporate groovy idioms as you ramp up.* You can cherry pick what parts you want
- Groovy is incredibly easy to learn. * Very java-ish compared to other alternative languages. * My experience was that it took almost no time to learn. * Doesn’t require reading a book or learning a new paradigm.
- * You can incorporate groovy idioms as you ramp up.* You can cherry pick what parts you want
- Package protected is rarely used, but an annotation is available.Public and private are most common.
- Package protected is rarely used, but an annotation is available.Public and private are most common.
- Package protected is rarely used, but an annotation is available.Public and private are most common.
- Great for one-off callbacks with frameworks (JdbcTemplates, PreparedStatementCreator, runnables, etc..)
- So here’s what we started with – pretty vanilla java
- And we’ve turned it into a trivial amount of code
- Everything in java.util is imported by default, so you won’t accidentally include emory lists or something.
- Everything in java.util is imported by default, so you won’t accidentally include emory lists or something.
- You can use def for defining variables, meaning you don’t have to type class names twice.
- Excluding return can clean up simple properties and calculations. For larger methods I find that it improves readability to leave them in.
- Simplified collection construction, very nice!
- Simplified collection construction, very nice!
- Simplified collection construction, very nice!
- Simplified collection construction, very nice!
- Instead of calling setX, setY, we have a nice way of setting bean properties.Great for simple DI and test construction.
- Each – you want to do something over every item in a list
- INJECT!
- This is what they’re actually called.Removes a lot of ugly code involving string concatenation with plusses, or String.format.
- Feeds the next example
- From actual service code.Converting from transport objects to a persisted domain modelPreviously had about 15 lines of anonymous class implementations calling different overloadsOne lambda to rule them all, dynamic multicastWhich is…
- Defs become implicit.Better compile-time support, loss of dynamicismSpeed parity with Java for performance-sensitive codeAlso addsTraits