What do you mean by Lazy evaluation?

Anjali Sharma answered on January 4, 2023 Popularity 6/10 Helpfulness 1/10

answer What do you mean by Lazy evaluation?

What do you mean by Lazy evaluation?

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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 6/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript mean

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Contributed on Jan 04 2023

Anjali Sharma

0 Answers Avg Quality 2/10

What do you mean by Lazy evaluation?

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