prototype chain in javascript

Relieved Rook answered on March 26, 2020 Popularity 10/10 Helpfulness 1/10

answer prototype chain in javascript

related what is prototype chaining

related chaining prototype methods

related prototype chain in javascript

prototype chain in javascript

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var o = {
  a: 2,
  m: function() {
    return this.a + 1;
  }
};

console.log(o.m()); // 3
// When calling o.m in this case, 'this' refers to o

var p = Object.create(o);
// p is an object that inherits from o

p.a = 4; // creates a property 'a' on p
console.log(p.m()); // 5
// when p.m is called, 'this' refers to p.
// So when p inherits the function m of o, 
// 'this.a' means p.a, the property 'a' of p

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: developer.mozilla.org

Tags: javascript prototype-chain

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Contributed on Mar 26 2020

Relieved Rook

0 Answers Avg Quality 2/10

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what is prototype chaining

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que - what is prototype chaining

ans - Prototype chaining is a feature in JavaScript that allows objects to 
inherit properties and methods from other objects. 
It is a key aspect of the language's prototype-based inheritance model.
In JavaScript, every object has a prototype, which is another object 
from which it inherits properties and methods.This chain of prototypes 
forms what is known as the prototype chain.

example -
  
function Person(firstname, lastname) {
    this.firstname = firstname
    this.lastname = lastname
}
Person.prototype.getFullName = function () {
    return this.firstname + ' ' + this.lastname
}
let x = new Person('ash', 'gole')
console.log('firstname ', x.firstname)
console.log('getFullName', x.getFullName())
console.log('firstname ', x.hasOwnProperty('firstname'))
console.log('getFullName ', x.hasOwnProperty('getFullName'))

//object example
const info = {
    name: 'john smith',
    city: 'london',
    age: 30
}
let info2 = Object.create(info)
console.log('info2 ',info2.age )

Popularity 7/10 Helpfulness 4/10 Language javascript

Source: ashabb.com

Tags: javascript

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Contributed on Jun 28 2024

ASHABB

0 Answers Avg Quality 2/10

chaining prototype methods

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function Shape(){//from  ww  w.j a  v a  2  s .  co  m
   this.isDrawable = true;
}
Shape.prototype.getDrawable = function(){
   return this.isDrawable;
};

function Rectangle(){
   this.hasFourEdges = false;
}

//inherit from Shape
Rectangle.prototype = new Shape();

Rectangle.prototype.getFourEdges = function (){
   return this.hasFourEdges;
};

var instance = new Rectangle();
console.log(instance.getDrawable());   //true

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: www.java2s.com

Tags: chaining chainin

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Contributed on Aug 16 2022

Courageous Cow

0 Answers Avg Quality 2/10

prototype chain in javascript

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{
    prop: "some value",
    __proto__: {
        foo: "bar",
        constructor: ƒ doSomething(),
        __proto__: {
            constructor: ƒ Object(),
            hasOwnProperty: ƒ hasOwnProperty(),
            isPrototypeOf: ƒ isPrototypeOf(),
            propertyIsEnumerable: ƒ propertyIsEnumerable(),
            toLocaleString: ƒ toLocaleString(),
            toString: ƒ toString(),
            valueOf: ƒ valueOf()
        }
    }
}

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Mar 26 2020

Relieved Rook

0 Answers Avg Quality 2/10

prototype chain in javascript

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prototype chain in javascript

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what is prototype chaining

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