The groovy puzzlers (as Presented at Gr8Conf US 2014)
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The document consists of a series of humorous questions and coding examples presented by two entertainers. It includes various programming concepts, coding tips, and references to social media for feedback. Additional content features a mix of code snippets, error messages, and programming humor.
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![def key = 'x'
def map = [key: 'treasure']
def value = map.get(key)
println value](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-39-320.jpg)
![def key = 'x'
def map = [key: 'treasure']
def value = map.get(key)
println value](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-40-320.jpg)
![1.def map = [(key): 'treasure']
2.map.put(key, 'treasure')
3.map."$key" = 'treasure'
4.map[key] = 'treasure'](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-43-320.jpg)
![def map = [2: 'treasure']
def key = 2
def value = map."$key"
println value](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-45-320.jpg)
![def map = [2: 'treasure']
def key = 2
def value = map."$key"
println value](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-46-320.jpg)
![def map = [2: 'treasure']
println map.keySet().first().class.name
java.lang.Integer](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-48-320.jpg)
![List<Integer> list = [1,2,3]
def now = new Date()
list << now
println list](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-51-320.jpg)
![List<Integer> list = [1,2,3]
def now = new Date()
list << now
println list](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-52-320.jpg)
![List<Integer> list = [1,2,3]
def now = new Date()
list << now
list << 'foo'
println list*.class.name
[java.lang.Integer, java.lang.Integer,
java.lang.Integer, java.util.Date,
java.lang.String]](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-57-320.jpg)
![def map = [metaClass: ]
println "What's the $map.metaClass, Andres?"](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-59-320.jpg)
![[0..9].each { println(it - 1) }](https://image.slidesharecdn.com/zyp1lplfrvwobgbss36b-signature-ae9da9c84466cafe46fd05e255e2f0cf51d5a75511e857248356fa8f2bfab91a-poli-140801153439-phpapp01/85/The-groovy-puzzlers-as-Presented-at-Gr8Conf-US-2014-66-320.jpg)
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The groovy puzzlers (as Presented at Gr8Conf US 2014)
- 10. 1. Funny Puzzling questions 2. You think and vote 3. Lots of T-shirts flying in the air 4. Official twitter handle! groovypuzzlers 5. Two entertaining guys on stage
- 13. 遺辿糸姻庄界?!
- 16. -3.abs()
- 18. (-3).abs() int value = -3 value.abs()
- 23. -3 Caught: java.lang.NullPointerException: Cannot invoke method abs() on null object java.lang.NullPointerException: Cannot invoke method abs() on null object at AbsolutelyGroovy.run(AbsolutelyGroovy.groovy:7) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134) println (-3).abs()
- 24. All problems in computer science can be solved by another pair of parentheses John McCarthy, the inventor of LISP
- 25. println ((-3).abs()) int value = -3 println value.abs()
- 28. def range = 1.0..10.0 assert range.contains(5.0) println range.contains(5.6)
- 33. Iterator iterator = (1.0..10.0).iterator() while (iterator.hasNext()) { print "${iterator.next()} " } 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
- 39. def key = 'x' def map = [key: 'treasure'] def value = map.get(key) println value
- 40. def key = 'x' def map = [key: 'treasure'] def value = map.get(key) println value
- 43. 1.def map = [(key): 'treasure'] 2.map.put(key, 'treasure') 3.map."$key" = 'treasure' 4.map[key] = 'treasure'
- 45. def map = [2: 'treasure'] def key = 2 def value = map."$key" println value
- 46. def map = [2: 'treasure'] def key = 2 def value = map."$key" println value
- 48. def map = [2: 'treasure'] println map.keySet().first().class.name java.lang.Integer
- 51. List<Integer> list = [1,2,3] def now = new Date() list << now println list
- 52. List<Integer> list = [1,2,3] def now = new Date() list << now println list
- 57. List<Integer> list = [1,2,3] def now = new Date() list << now list << 'foo' println list*.class.name [java.lang.Integer, java.lang.Integer, java.lang.Integer, java.util.Date, java.lang.String]
- 59. def map = [metaClass: ] println "What's the $map.metaClass, Andres?"
- 66. [0..9].each { println(it - 1) }
- 76. boolean isPrime(def x) { if (x == 2) return true int limit = Math.sqrt(x) + 1 (2..limit).each { if (x % it == 0) { return false } } true } println isPrime("4" as Double)
- 78. boolean isPrime(def x) { if (x == 2) return true int limit = Math.sqrt(x) + 1 (2..limit).each { if (x % it == 0) { return false } } true } println isPrime("4" as Double)
- 79. boolean isPrime(def x) { if (x == 2) return true int limit = Math.sqrt(x) + 1 (2..limit).each { if (x % it == 0) { return false } } true } println isPrime("4" as Double)
- 90. class VanHalen { public static jump() { "Here are the ${lyrics()}" } def methodMissing(String name, def args) { 'lyrics' } } println VanHalen.jump()
- 91. class VanHalen { public static jump() { "Here are the ${lyrics()}" } def methodMissing(String name, def args) { 'lyrics' } } println VanHalen.jump()
- 96. class VanHalen { public static jump() { "Here are the ${lyrics()}" } static $static_methodMissing(String name, def args) { 'lyrics' } } println VanHalen.jump()
- 97. class VanHalen { public jump() { "Here are the ${lyrics()}" } def methodMissing(String name, def args) { 'lyrics' } } println new VanHalen().jump()
- 99. double value = 3 println "$value.14".isDouble()
- 103. double value = 3 println "$value.14".isDouble()
- 108. class Invite { int attending = 1 } def invite = new Invite() def attendees = (invite.attending) +1 println attendees
- 109. class Invite { int attending = 1 } def invite = new Invite() def attendees = (invite.attending) +1 println attendees
- 114. def attendees = (new Invite().attending) + 1 println attendees def invite = new Invite() println (invite.attending +1)
- 117. 1. Write readable code 2. Comment neat tricks 3. Sometimes it is just a bug 4. Use static code analysis (intellij IDEA!) 5. Rtfm 6. Dont code like my brother
- 118. We have just started! (may end up in proper overalls) Puzzlers? Gotchas? Fetal position inducing behavior? - puzzlers jfrog.com - Groovypuzzlers
- 120. Positive feedback? Praise us on twitter groovypuzzlers - aalmiray - jbaruch Negative feeback? /dev/null