Breaking News: Grepper is joining You.com. Read the official announcement!

What do you mean by Lazy evaluation?

Add Answer

Anjali Sharma answered on January 4, 2023 Popularity 5/10 Helpfulness 1/10

answer What do you mean by Lazy evaluation?

What do you mean by Lazy evaluation?

Comment

Lazy evaluation is an evaluation strategy which holds the evaluation of an expression until its value is needed.

It avoids repeated evaluation.

Haskell is a good example of such a functional programming language whose fundamentals are based on Lazy Evaluation.

package com.basicsstrong.apidesign;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Parctice02 {

	public static void main(String[] args) {


		List<Person> persons = new ArrayList<>();
		persons.add(new Person("John",36));
		persons.add(new Person("Erick",39));
		persons.add(new Person("Mickel",56));
		persons.add(new Person("Bob",33));

		// This is just a Intermediate Operation Let see if the get Method gets executed by
		// Putting a Debug code there

		Stream<Person> stream = persons.stream()
			   .filter(e -> e.getAge() <= 36);

		// Nothing Happenes.

		// Let's now add one terminal operation


		List<Person> newlist = persons.stream()
				   .filter(e -> e.getAge() <= 36)
				   .collect(Collectors.toList());
		// See the getMethod call takes place and Stream is filtered

		System.out.println(newlist);
	}

}

class Person{

	String name;
	int age;

	public Person(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {

		System.out.println("I am in getAge Mthod of Persons");

		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + "]";
	}


}

Popularity 5/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript mean

Link to this answer
Share Copy Link

Contributed on Jan 04 2023

Anjali Sharma

0 Answers Avg Quality 2/10

What do you mean by Lazy evaluation?

Contents

More Related Answers

What do you mean by Lazy evaluation?

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.