Posts (page 209)
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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.
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2 min readTo clear a text file without deleting it using Groovy, you can open the file in write mode and then truncate the contents of the file. This can be done by creating a new BufferedWriter object and passing it the file object in write mode. Then, you can use the truncate() method to clear the contents of the file. Remember to close the BufferedWriter object after writing to the file to ensure that changes are saved properly.
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5 min readTo download a jar file from a URL using Groovy, you can use the following code snippet: @GrabResolver(name='bintray', root='http://dl.bintray.com/content/shapeshift/maven') @Grab('com.shapeshift:zabox-core:0.1.5') import groovyx.net.http.HTTPBuilder def url = 'https://example.com/file.jar' def outputFile = new File('file.jar') new HTTPBuilder(url).get { resp, body -> outputFile.
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5 min readIn Groovy, you can join a list of maps using the collect method. The collect method allows you to transform each element in the list before joining them together. First, create a list of maps that you want to join. Then, use the collect method to extract a specific value from each map and join them together using the join method. This will give you a string representation of the combined values from all the maps in the list.
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4 min readTo create a property using Groovy script, you can simply declare a variable and assign a value to it. For example, you can create a property named "name" and assign it a value like this:def name = "John"This will create a property named "name" with the value of "John". You can then access and manipulate this property in your Groovy script as needed.