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Model-Question-Paper--PROGRAMMING-IN-C-AND-DATA-STRUCTURES--14PCD1314PCD23-->View question


Asked On2019-08-16 18:37:43 by:Annaliya

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Javascript is an object-oriented language, this means most of the things in the Javascript are objects, for example, functions are objects. Everything is an object except the primitive data types in the language, which are boolean, null, number, string, undefined.
Like other programming language, parameters to a function is passed by value or by reference.
Passing by value means that you create a copy of the present value but just the value is copied not the address ie two parameters are different if they are passed by value. As one variable cannot have the same value as another variable all the time.
But passing by reference means that you are creating an alias to the current object, ie you're giving another name to the same object. So whenever the value is changed of an object it's alias's value also get changed.
So the thing is, all the primitive data types are passed by value. Let me give you an example:-
var name = 'a';  
change(name);
function change(firstname){
firstname = b;
console.log(firstname); //output will be b
}
console.log(name); //output will be a
// so you can see that value does not get copied when you pass the value in functions.
But when you will pass by reference ie when you will pass an object to a function the value will change.
var myname = { name = "rajesh"};
function change(id){
iid.name = "pablo";
console.log(id.name); //output will be pablo
}
console.log(myname.name); // output will be pablo too

// so all in all when a primitive data type is passed it is passed by its value, but when an object is passed it is passed by its reference/address.




Answerd on:2019-08-23 Answerd By:sankalp2798

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Javascript is an object-oriented language, this means most of the things in the Javascript are objects, for example, functions are objects. Everything is an object except the primitive data types in the language, which are boolean, null, number, string, undefined.
Like other programming language, parameters to a function is passed by value or by reference.
Passing by value means that you create a copy of the present value but just the value is copied not the address ie two parameters are different if they are passed by value. As one variable cannot have the same value as another variable all the time.
But passing by reference means that you are creating an alias to the current object, ie you're giving another name to the same object. So whenever the value is changed of an object it's alias's value also get changed.
So the thing is, all the primitive data types are passed by value. Let me give you an example:-
var name = 'a';  
change(name);
function change(firstname){
firstname = b;
console.log(firstname); //output will be b
}
console.log(name); //output will be a
// so you can see that value does not get copied when you pass the value in functions.
But when you will pass by reference ie when you will pass an object to a function the value will change.
var myname = { name = "rajesh"};
function change(id){
iid.name = "pablo";
console.log(id.name); //output will be pablo
}
console.log(myname.name); // output will be pablo too

// so all in all when a primitive data type is passed it is passed by its value, but when an object is passed it is passed by its reference/address.


Answerd on:2019-09-03 Answerd By:Annaliya

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