How else can you create an array in JavaScript?

var arr = Array("a", "b", "c");

What is a class in ES6?

A template for creating objects.

How do you handle a click event in JavaScript?

element.onClick = function() {...};

What does arr.length return?

The number of elements in the array.

What does the spread operator do in ES6?

Spreads elements of an iterable (like an array) into individual elements.

What is an object in JavaScript?

A collection of properties and methods.

How do you add a method to an object?

obj.method = function() { ... };

What is an enhancement in ES6 regarding objects?

Shorter syntax for method definitions

What is the purpose of form validation in JavaScript?

To check the accuracy of form input before submission.

What are Promises in ES6 used for?

To handle asynchronous operations.

What is ES6 in the context of JavaScript?

The sixth edition of ECMAScript, a JavaScript standard.

What is the correct way to initialize an object?

var person = {"name": "Alice", "age": 25};

What does destructuring allow in ES6?

Breaking an object or array into individual variables.

How do you add a new HTML element in JavaScript?

document.createElement("element");

ow do you change the text of an HTML element in JavaScript?

element.innerHTML = "New Text";

What is a Map in ES6?

A data structure for key-value pairs, maintaining insertion order.

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Javascript Intermediate

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Questions 28

Answers

1
How else can you create an array in JavaScript?
var arr = Array("a", "b", "c");
var arr = newArray("a", "b", "c");
var arr = createArray("a", "b", "c");
var arr = {"a", "b", "c"};
2
What is a class in ES6?
A function for inheritance
A new data type
A method of an object
A template for creating objects.
3
How do you handle a click event in JavaScript?
element.onClick = function() {...};
element.trigger("click");
element.whenClicked(function() {...});
element.addEventListener("hover");
4
What does arr.length return?
The number of elements in the array.
The first element of the array.
Undefined.
The last element of the array.
5
What are the two phases of event propagation in JavaScript?
Initial and Final
Start and End
Trigger and Response
Capture and Bubble
6
What does the spread operator do in ES6?
Converts data types
Merges two arrays into a new array
Compresses multiple values into one
Spreads elements of an iterable (like an array) into individual elements.
7
What is a key feature of variables declared with let and const in ES6?
They allow hoisting.
They are globally scoped.
They have block-level scope.
They are constants by default.
8
What is an object in JavaScript?
A loop structure.
A data type for numbers.
A function for performing operations.
A collection of properties and methods.
9
What is the purpose of the Math object?
To manipulate HTML elements.
To handle dates and times.
To create animations.
To perform mathematical tasks.
10
What does DOM stand for in JavaScript?
Document Object Model
Dynamic Object Manipulation
Data Object Model
Display Object Management
11
How do you select an HTML element with id "myElement" in JavaScript?
selectElement("myElement")
getElement("myElement")
findElementById("myElement")
querySelector("#myElement")
12
How do you add a method to an object?
method(obj) { ... };
obj.method = function() { ... };
obj = method() { ... };
obj += function() { ... };
13
What is an enhancement in ES6 regarding objects?
Automatic type conversion
Ability to clone objects
Objects are immutable
Shorter syntax for method definitions
14
What is the Date object used for in JavaScript?
To perform mathematical calculations.
To manipulate CSS styles.
To create HTML elements.
To handle dates and times.
15
What is the purpose of form validation in JavaScript?
To check the accuracy of form input before submission.
To send form data to a server
To style forms
To create dynamic forms
16
What are Promises in ES6 used for?
To handle asynchronous operations.
To define new variables.
To manipulate HTML elements.
To loop through arrays.
17
What is ES6 in the context of JavaScript?
A JavaScript library
An HTML extension for JavaScript
The sixth edition of ECMAScript, a JavaScript standard.
A new programming language
18
What is the correct way to initialize an object?
var person = <"name": "Alice", "age": 25>;
var person = ["name", "Alice", "age", 25];
var person = {"name": "Alice", "age": 25};
var person = ("name", "Alice", "age", 25);
19
What is essential for creating an image slider in JavaScript?
Conditional statements
A for loop
Using the Math object
Manipulating the DOM
20
What does destructuring allow in ES6?
Creating nested objects
Encrypting object properties
Breaking an object or array into individual variables.
Combining multiple objects into one
21
How do you add a new HTML element in JavaScript?
document.addNewElement("element");
document.createElement("element");
document.newElement("element");
document.appendChild("element");
22
ow do you change the text of an HTML element in JavaScript?
element.text = "New Text";
element.innerHTML = "New Text";
element.setText("New Text");
element.changeText("New Text");
23
What ES6 feature is used to write shorter functions?
Template literals
while loops
for loops
Arrow functions
24
What are associative arrays in JavaScript?
Arrays with named indexes.
Arrays sorted in associative order.
Arrays with numerical indexes.
A special type of object.
25
Which of the following is an array in JavaScript?
var arr = //;
var arr = [];
var arr = ();
var arr = {};
26
How do you create an object in JavaScript?
var obj = <>
var obj = new Object();
var obj = [];
var obj = ();
27
What is a Map in ES6?
A data structure for key-value pairs, maintaining insertion order.
A tool for geographical mapping
A function for mapping values
A method for setting object properties
28
Which method repeats a function at set intervals, useful for animations?
animate()
setInterval()
requestAnimationFrame()
setTimeout()

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