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Quellen/IT/Sorting List in Groovy Language.md

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+---
+title: Sorting List in Groovy Language
+tags:
+  - IT/Development/Groovy
+---
+
+While writing my code in groovy scripting language, I encountered a problem on how to sort a list or an array of objects. As a newbie in groovy, I was eager to look for simpler groovy way to sort a list and was so surprise when I read a blog article. I learned a very easy and readable way of sorting.
+
+## Sort Numbers
+
+```groovy
+def numberList = [4,2,5,3,1]
+assert [1,2,3,4,5] = numberList.sort()
+```
+
+
+## Sort Letters
+
+```groovy
+def alphaList = [c,d,a,b,e]
+assert [a,b,c,d,e] = alphaList.sort()
+```
+
+
+## Sort Object by its Field
+
+```groovy
+// Create a object under file name Student.groovy
+class Student{
+    int id
+    String fullName
+}
+ 
+//Explanation
+def studentList = [ new Student(id: 2, name: Beta),
+            new Student(id: 1, name: Charley),
+            new Student(id: 3, name: Alpha)
+          ]
+ 
+//output will be Charley, Beta, Alpha
+studentList.sort{ it.id }
+ 
+//output will be Alpha, Beta, Charley
+studentList.sort{ it.name }
+```
+
+Take note of the use of the sort closure sort {} verses the sort() method.As of now, I am not sure how that works but as long as it solves my problem and test is working. I am good!