Usage of lambda/stream/lastcount in Selenide

Tutorial 12​​ –​​ Usage of lambda function, Stream/filter, last count​​ in​​ Selenide

What you will Learn in this blog:

• Usage of​​ lambda function​​ 

• Usage of​​ Stream and filter

• Usage of last count

• Code snippet

Usage of​​ lambda function

In the last blog we had seen how to print the element’s text and ‘href’ using a ‘for’ loop

​​ 

Let us see how to get the same information using a lambda function.

Note:​​ Lambda functions, unlike methods, do not need a name. Lambda function can be implemented right in the body of a method.

The highlighted section below is a lambda expression

Execute, notice below that text of each element (including all the courses) is printed

Similarly, we can append the ‘href’ attribute

Usage of Stream and filter

If you notice the console output, there is lot of white space.​​ We can remove or filter this white space using streams

The​​ below​​ syntax​​ will serve the purpose. We are​​ filtering the empty text and ignoring it. We are then sending this filtered data to ‘foreach’ block

So we have

Execute. Notice below that white space is no more

Usage of last count

Let​​ us say we want to print the text of only last 5 courses

To achieve this, we can use ‘last()’ method as shown below

Execute, notice below that the text of last 5 links gets printed in console

Code snippet

package​​ w2a.selenide;

import​​ static​​ com.codeborne.selenide.Selenide.$$;

import​​ static​​ com.codeborne.selenide.Selenide.open;

import​​ java.net.MalformedURLException;

import​​ org.openqa.selenium.By;

import​​ org.testng.annotations.Test;

import​​ com.codeborne.selenide.Configuration;

import​​ com.codeborne.selenide.ElementsCollection;

public​​ class​​ ElementsTest {

 @Test

 public​​ void​​ searchTest()​​ throws​​ InterruptedException, MalformedURLException {

  Configuration.browser​​ =​​ "firefox";

  open("https://www.selenium-tutorial.com/courses");

  ElementsCollection​​ counts​​ =​​ $$(By.tagName("a"));

  /*

  //lambda expression

  counts.forEach(l -> System.out.println(l.getText()));

  counts.forEach(l -> System.out.println(l.getText()+ "########" + l.getAttribute("href")));

  //stream/filter

  counts.stream().filter(f -> !f.getText().isEmpty()).forEach(f -> System.out.println(f.getText()));

  */

  //last count

  counts.last(5).forEach(l​​ -> System.out.println(l.getText()));

  Thread.sleep(5000);

 }

}

Thank you for reading!