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new keyword in js

Wandering Wolf answered on January 22, 2020 Popularity 10/10 Helpfulness 2/10

answer new keyword in js

related keyword new js

new keyword in js

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ObjMaker = function() {this.a = 'first';};
// ObjMaker is just a function, there's nothing special about it that makes 
// it a constructor.

ObjMaker.prototype.b = 'second';
// like all functions, ObjMaker has an accessible prototype property that 
// we can alter. I just added a property called 'b' to it. Like 
// all objects, ObjMaker also has an inaccessible [[prototype]] property
// that we can't do anything with

obj1 = new ObjMaker();
// 3 things just happened.
// A new, empty object was created called obj1.  At first obj1 was the same
// as {}. The [[prototype]] property of obj1 was then set to the current
// object value of the ObjMaker.prototype (if ObjMaker.prototype is later
// assigned a new object value, obj1's [[prototype]] will not change, but you
// can alter the properties of ObjMaker.prototype to add to both the
// prototype and [[prototype]]). The ObjMaker function was executed, with
// obj1 in place of this... so obj1.a was set to 'first'.

obj1.a;
// returns 'first'
obj1.b;
// obj1 doesn't have a property called 'b', so JavaScript checks 
// its [[prototype]]. Its [[prototype]] is the same as ObjMaker.prototype
// ObjMaker.prototype has a property called 'b' with value 'second'
// returns 'second'

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: javascript keyword

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Contributed on May 22 2020

Wandering Wolf

0 Answers Avg Quality 2/10

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keyword new js

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function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}
//create a object with three keys, make, model, and year

var myCar = new Car('Eagle', 'Talon TSi', 1993);
// use the new operator to create any number of car objects with this template object Car above

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jan 22 2020

Happy Hyena

0 Answers Avg Quality 2/10

new keyword in js

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**Important Points** 

1.It creates a new object. The type of this object is object.
2.It sets this new object's internal, inaccessible, [[prototype]] (i.e. __proto__) property to be the constructor function's external, accessible, prototype object (every function object automatically has a prototype property).
3.It makes the this variable point to the newly created object.
4.It executes the constructor function, using the newly created object whenever this is mentioned.
5.It returns the newly created object, unless the constructor function returns a non-null object reference. In this case, that object reference is returned instead.
Note: constructor function refers to the function after the new keyword, as in

new ConstructorFunction(arg1, arg2)

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on May 22 2020

Wandering Wolf

0 Answers Avg Quality 2/10

javascript new keyword

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// Constructor function
function Person(name, age) {
  this.name = name;
  this.age = age;
}

// Creating a new instance using the new keyword
const person1 = new Person('John Doe', 25);

console.log(person1.name); // Output: John Doe
console.log(person1.age); // Output: 25

Popularity 3/10 Helpfulness 1/10 Language javascript

Source: Grepper

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

new keyword in javascript

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// Constructor function
function Person(name, age) {
  this.name = name;
  this.age = age;
}

// Creating an instance using "new"
const person1 = new Person('John Doe', 30);

console.log(person1.name); // Output: John Doe
console.log(person1.age);  // Output: 30

Popularity 5/10 Helpfulness 1/10 Language javascript

Source: Grepper

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

new keyword in JS

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-1

It does 5 things:

It creates a new object. The type of this object is simply object.
It sets this new object's internal, inaccessible, [[prototype]] (i.e. __proto__) property to be the constructor function's external, accessible, prototype object (every function object automatically has a prototype property).
It makes the this variable point to the newly created object.
It executes the constructor function, using the newly created object whenever this is mentioned.
It returns the newly created object, unless the constructor function returns a non-null object reference. In this case, that object reference is returned instead.

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Aug 15 2022

Creepy Caribou

0 Answers Avg Quality 2/10

new keyword in js

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