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6 min readRegular expressions in Groovy can be used by creating a java.util.regex.Pattern object and then using it to match against a string. You can use methods like find(), matches(), and split() to perform different operations on a string using the regular expression pattern. Additionally, Groovy provides its own syntax for specifying regular expressions using slashes (/regex/), making it easier to work with regular expressions in Groovy scripts.
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7 min readIn Groovy, exceptions are handled using try-catch blocks. When you anticipate that a certain section of code may throw an exception, you can enclose that code within a try block. If an exception occurs within the try block, the catch block will handle it and execute the specified code.You can also use a finally block to execute code that should run regardless of whether an exception is thrown or not. This block is commonly used for closing resources or cleaning up operations.
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3 min readTo write to a file in Groovy, you can use the File class provided by Groovy. You can create a new File object by specifying the path of the file you want to write to. Then, you can use the withWriter method to open a writer and write your content to the file. Here is an example: def content = "Hello, World!" def file = new File("example.txt") file.withWriter { writer -> writer.write(content) } println "Content has been written to the file.
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3 min readTo read from a file in Groovy, you can use the Java FileReader and BufferedReader classes. First, you need to create a new FileReader object with the path to the file you want to read. Then, wrap the FileReader in a BufferedReader to efficiently read the file line by line. Finally, use a loop to read each line from the file until you reach the end. You can also use the eachLine() method provided by Groovy to simplify the process of reading a file line by line.
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3 min readTo loop through a list in Groovy, you can use a for loop or a for each loop. The for loop allows you to iterate over the list using an index and accessing elements by their position. The for each loop is more convenient as it directly iterates over the elements of the list without the need for an index.You can also use the each() method with a closure to loop through a list. This method takes a closure as an argument and executes the closure for each element in the list.
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4 min readIn Groovy, a function can be defined using the keyword 'def' followed by the function name, parameters (if any), and the body of the function enclosed in curly braces. For example, a simple function that takes two parameters and returns their sum can be defined as follows:def sum(int a, int b) { return a + b }Functions in Groovy can also have optional return types specified after the parameter list, similar to Java.
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4 min readIn Groovy, you can declare a variable simply by assigning a value to it. Groovy is a dynamically typed language, so you don't need to specify the variable type when declaring it. For example, you can declare a variable named 'name' and assign it a string value like this: name = "John"You can also declare variables without assigning a value initially, like this: def ageIn this case, the variable 'age' is declared but not initialized with a value.
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3 min readIn Groovy, you can access the properties of a delegate object using the "delegate" keyword. This keyword refers to the object that has been delegated to by the current object. You can simply use the dot notation to access the properties of the delegate object. For example, if you have delegated an object called "myDelegate" to another object, you can access its properties like this: delegate.propertyName.
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4 min readTo perform git checkout using a Groovy script, you can use the "sh" step in a Jenkins pipeline. Here's an example of how you can do this: pipeline { agent any stages { stage('Checkout') { steps { script { sh 'git checkout <branch-name>' } } } } } Replace <branch-name> with the name of the branch you want to checkout.
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5 min readTo read a sheet in CSV using Groovy, you can use the built-in functionality available in Groovy for working with CSV files. You can use the CsvParser class to read the CSV file and then iterate over each row in the sheet to access the data.To start, you'll need to import the necessary classes for working with CSV files in Groovy. Then, you can create a new instance of CsvParser and pass in the CSV file to read.
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4 min readTo import a Groovy package or class into a pipeline in Jenkins, you can use the 'import' statement at the beginning of your Jenkinsfile. This statement allows you to access and use the functionalities of the specified package or class within your pipeline script. By importing the necessary packages or classes, you can leverage their features and capabilities to streamline and enhance your pipeline workflow.