Madanswer Technologies Interview Questions Data|Agile|DevOPs|Python - Recent questions in ECMAScript

What are constants?

Mon, 02 Mar 2020 10:35:42 +0000

What are constants?

What are the classes and proxies?

Mon, 02 Mar 2020 10:35:23 +0000

What are the classes and proxies?

What is the advantage of using Webpack?

Mon, 02 Mar 2020 10:35:09 +0000

What is the advantage of using Webpack?

What is Webpack ?

Mon, 02 Mar 2020 10:34:52 +0000

What is Webpack ?

What is spread, default and rest parameter?

Mon, 02 Mar 2020 10:34:37 +0000

What is spread, default and rest parameter?

Define Temporal Dead Zone in ES6.

Mon, 02 Mar 2020 10:34:23 +0000

Define Temporal Dead Zone in ES6.

What is a generator in JavaScript?

Mon, 02 Mar 2020 10:34:06 +0000

What is a generator in JavaScript?

Explain the reason for using ES6 classes.

Mon, 02 Mar 2020 10:33:27 +0000

Explain the reason for using ES6 classes.

Differentiate between .call and .apply.

Mon, 02 Mar 2020 10:33:06 +0000

Differentiate between .call and .apply.

Differentiate between ES6 class and ES5 function constructors.

Mon, 02 Mar 2020 10:32:48 +0000

Differentiate between ES6 class and ES5 function constructors.

Explain the benefits of using spread syntax in ES6. How is it different from the rest of the syntax?

Mon, 02 Mar 2020 10:32:28 +0000

Explain the benefits of using spread syntax in ES6. How is it different from the rest of the syntax?

Explain the motivation behind Symbols to ES6.

Mon, 02 Mar 2020 10:32:10 +0000

Explain the motivation behind Symbols to ES6.

Why are arrow functions used in ES6?

Mon, 02 Mar 2020 10:31:48 +0000

Why are arrow functions used in ES6?

What do you mean by IIFEs (Immediately Invoked Function Expressions)?

Mon, 02 Mar 2020 10:31:32 +0000

What do you mean by IIFEs (Immediately Invoked Function Expressions)?

Explain the difference between ES5 and ES6?

Mon, 02 Mar 2020 10:31:11 +0000

Explain the difference between ES5 and ES6?

How To Create A Javascript Class In Es6?

Mon, 02 Mar 2020 10:30:52 +0000

How To Create A Javascript Class In Es6?

Explain Destructuring Assignment In Es6?

Mon, 02 Mar 2020 10:30:33 +0000

Explain Destructuring Assignment In Es6?

What Is Spread Operator In Es6?

Mon, 02 Mar 2020 10:30:09 +0000

What Is Spread Operator In Es6?

What Are Template Literals In Es6?

Mon, 02 Mar 2020 10:29:44 +0000

What Are Template Literals In Es6?

Explain Constants In Es6?

Mon, 02 Mar 2020 10:29:22 +0000

Explain Constants In Es6?

List Benefits Of Using Webpack?

Mon, 02 Mar 2020 10:29:04 +0000

List Benefits Of Using Webpack?

What Is Webpack in ES6?

Mon, 02 Mar 2020 10:28:39 +0000

What Is Webpack?

List Steps To Install Babel?

Mon, 02 Mar 2020 10:28:13 +0000

List Steps To Install Babel?

What Is Babel in ES6?

Mon, 02 Mar 2020 10:27:54 +0000

What Is Babel?

List Some New Features Of Es6?

Mon, 02 Mar 2020 10:27:27 +0000

List Some New Features Of Es6?

What Is Es6?

Mon, 02 Mar 2020 10:27:11 +0000

What Is Es6?

All major JavaScript Implementations are based on which standard?

Tue, 21 Jan 2020 14:21:04 +0000

All major JavaScript Implementations are based on which standard?

(1)ECMA

(2)ECMAScript

(3)Lava

(4)CoffeeScript

The following code implements the ______ feature of ES6 function myFunction(x, y, z) { } var args = [0, 1, 2]; myFunction(...args);

Tue, 21 Jan 2020 14:20:34 +0000

The following code implements the ______ feature of ES6

function myFunction(x, y, z) { }

var args = [0, 1, 2];

myFunction(...args);

(1)sets

(2)spread

(3)rest

(4)maps

Check the Below code and check correct or not const { x, y } = { x: 11, y: 8 }; is the Same as const { x: x, y: y } = { x: 11, y: 8 };

Tue, 21 Jan 2020 14:20:05 +0000

Check the Below code and check correct or not

const { x, y } = { x: 11, y: 8 };

is the Same as

const { x: x, y: y } = { x: 11, y: 8 };

(1)True

(2)False

What will be the output of following code snippet? function foo(a = 10, b = 5) { console.log(a, b); } foo(6);

Tue, 21 Jan 2020 14:19:28 +0000

What will be the output of following code snippet?

function foo(a = 10, b = 5) {

console.log(a, b);

}

foo(6);4

(1)10, 5

(2)10, 6

(3)undefined error

(4)6, 5

During destructuring, you can either declare variables or assign to them, or both. (1)False (2)True

Tue, 21 Jan 2020 14:18:40 +0000

During destructuring, you can either declare variables or assign to them, or both.

(1)False

(2)True

Destructuring helps us to extract multiple values from an object via __________.

Tue, 21 Jan 2020 14:18:16 +0000

Destructuring helps us to extract multiple values from an object via __________.

(1)Object Parameters

(2)Object Invocation

(3)Object Pattern

(4)Class instantiation

Which is not a lexical inside arrow functions?

Tue, 21 Jan 2020 14:17:40 +0000

Which is not a lexical inside arrow functions?

(1)super

(2)this

(3)new.target

(4)None of the options

(5)arguments

Variables declared in a scope are accessible in ___________.

Tue, 21 Jan 2020 14:17:10 +0000

Variables declared in a scope are accessible in ___________.

(1)anywhere in the program

(2)None of the options

(3)All scopes nested inside it

(4)that scope only

Template literals can be defined as _________.

Tue, 21 Jan 2020 14:16:37 +0000

Template literals can be defined as _________.

(1)HTML with blanks to be filled in

(2)Template method arguments

(3)multi-line string literals that support interpolation

(4)function calls

Arrow Functions are less verbose than traditional functions (1)False (2)True

Tue, 21 Jan 2020 14:16:07 +0000

Arrow Functions are less verbose than traditional functions

(1)False

(2)True

Template literals can be reused __________.

Tue, 21 Jan 2020 14:15:26 +0000

Template literals can be reused __________.

What will be the output of the following code snippet in ES6? const func= ( x, y ) => { return x + y; }; func(11,12);

Tue, 21 Jan 2020 14:15:03 +0000

What will be the output of the following code snippet in ES6?

const func= (

x,

y

) => {

return x + y;

};

func(11,12);

(1)None of the options

(2)Syntax Error

(3)23

(4)Logical Error

Template literals support ____________.

Tue, 21 Jan 2020 14:14:25 +0000

Template literals support ____________.

(1)Raw data

(2)interpolation

(3)function calls

(4)Restructuring

Which keywords can be used to implement inheritance in ES6?

Tue, 21 Jan 2020 14:13:41 +0000

Which keywords can be used to implement inheritance in ES6?

(1)extends

(2)derives

(3)inherits

(4)implements

The bodies of class declarations and class expressions are executed in strict mode. (1)True (2)False

Tue, 21 Jan 2020 14:12:42 +0000

The bodies of class declarations and class expressions are executed in strict mode.

(1)True

(2)False

_________ feature helps us to simplify the inheritance concept.

Tue, 21 Jan 2020 14:12:16 +0000

_________ feature helps us to simplify the inheritance concept.

Maps can be used to store __________.

Tue, 21 Jan 2020 14:11:40 +0000

Maps can be used to store __________.

(1)Geographical data

(2)Hash values

(3)Key - value pairs

(4)Relative Mapping

Which is not true about static methods?

Tue, 21 Jan 2020 14:09:42 +0000

Which is not true about static methods?

1)Static methods can be invoked without instantiating the class

(2)Static methods are not specific to any object.

(3)We can create utility functions with the help of static methods.

(4)Static methods can be directly called with the help of a class object.

Which is not true about static methods?

Tue, 21 Jan 2020 14:09:32 +0000

Below is the extends class code class Player extends Student { constructor(roll, name) { super(roll, name); this.Player = true; } }; Here, super(roll,name); refers to the

Tue, 21 Jan 2020 14:08:18 +0000

Below is the extends class code

class Player extends Student {

constructor(roll, name) {

super(roll, name);

this.Player = true;

}

};

Here, super(roll,name); refers to the

(1)None of the options

(2)Constructor of the Child class

(3)Constructor of the Parent Class

(4)Constructor of both the classes

What will be printed if the following code is executed? let x=150; if(x>100) { x=1; } console.log(x);

Tue, 21 Jan 2020 14:07:25 +0000

What will be printed if the following code is executed?

let x=150;

if(x>100)

{

x=1;

}

console.log(x);

(1)1

(2)150

(3)Error

(4)100

Which of the following statements is not true about level of scope?

Tue, 21 Jan 2020 14:06:41 +0000

Which of the following statements is not true about level of scope?

I. let keyword declares a block scoped variable.

II. var keyword declares a block scoped variable.

III. const keyword declares a block scoped variable.

IV. let and const are similiar to each other.

(1)I and IV are true and II and III are false

(2)I & II are true and III and IV are false.

(3)I & III are true and II and IV are false.

(4)I and IV are false and II and III are true.

Which of the following is not a state of Promise?

Tue, 21 Jan 2020 14:05:31 +0000

Which of the following is not a state of Promise?

(1)Rejected

(2)Approved

(3)Resolved

(4)Pending

Variables declared with which of the following constructs do not have block scope?

Tue, 21 Jan 2020 14:03:54 +0000

Variables declared with which of the following constructs do not have block scope?