What is constructor.constructor()() in JavaScript

/* A constructor in Javascript is used to create a new object and set values
for any existing object properties*/

class Animal{
  
  constructor (name, height, weight){
    console.log("created animal named", name)
  }
  nameLength() {
    return name.length;
    
  }
  
}
 var dog = new Animal("Fido", 25, 90);
 var fish = new Animal("Goldie", 2, .02);

	console.log(dog.nameLength);

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Source: Grepper

Tags: constructor cons

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Contributed on Sep 06 2022

Blessing Obajinmi

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constructor function javascript

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//Constructor Function
function BellBoy (name, age, hasWorkPermit, languages) {
  this.name = name;
  this.age = age;
  this.hasWorkPermit = hasWorkPermit;
  this.languages = languages;
}

//Create New Object From Constructor Using Arguments
var Earl = new BellBoy('Earl E.Bird', 23, true, ['French', 'German'])

//Access the Properties and Their Values
console.log('Name : ', Earl.name)
console.log('Age : ', Earl.age)
console.log('Verified Work Permit : ', Earl.hasWorkPermit)
console.log('Languages : ', Earl.languages)

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Contributed on Oct 03 2022

Jeremy L

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javascript constructor

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var MyConstructor = function(p1, p2, p3){
  this.p1 = p1;
  this.p2 = p2;
  this.p3 = p3;
};

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Source: Grepper

Tags: constructor cons

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Contributed on Nov 08 2021

FlashingMustard

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constructor function in javascript

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//Constructor function is  function that generate object.
//capital function name indicate it is constructor function
function Todo(name, completed) {
  console.log(this); //return empty object name todo
  this.name = name;
  this.completed = completed;
  this.getTodoName = function () {
    console.log(this.name);
  };
}
//new keyword do two things
//create new empty object
//and assign this with that object.
const todo = new Todo('Get Eggs', false);
console.log(todo); //log return object
todo.getTodoName(); //logo Get Eggs

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Contributed on Dec 17 2022

Shirshak Kandel

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what is the use of a constructor function in javascript

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// The function constructor can take in multiple statements separated by a semicolon. Function expressions require a return statement with the function's name

// Observe that new Function is called. This is so we can call the function we created directly afterwards
const sumOfArray = new Function('const sumArray = (arr) => arr.reduce((previousValue, currentValue) => previousValue + currentValue); return sumArray')();

// call the function
sumOfArray([1, 2, 3, 4]);
// 10

// If you don't call new Function at the point of creation, you can use the Function.call() method to call it
const findLargestNumber = new Function('function findLargestNumber (arr) { return Math.max(...arr) }; return findLargestNumber');

// call the function
findLargestNumber.call({}).call({}, [2, 4, 1, 8, 5]);
// 8

// Function declarations do not require a return statement
const sayHello = new Function('return function (name) { return `Hello, ${name}` }')();

// call the function
sayHello('world');
// Hello, world

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Source: developer.mozilla.org

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Contributed on Mar 06 2023

DaddyGuigz

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What is constructor.constructor()() in JavaScript

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