JavaScript ES6 to ES9 Features Quiz

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Questions and Answers

What does the .includes() method in ES7 allow you to do?

Combine multiple arrays into one

Check if specific values exist in an array (correct)

Sort an array in ascending order

Transform an array into an object

Which operator introduced in ES6 allows for asynchronous programming?

await operator (correct)

event operator

bind operator

class operator

Which ES8 feature allows for the use of trailing commas in function parameter lists?

Default parameters (correct)

Object literal updates

Promise chaining

Array destructuring

What does the spread operator do in ES9?

Enables cloning of an object Signup and view all the answers

In what way does the for-await-of loop enhance asynchronous iteration in ES9?

It converts iterables into an async iterator Signup and view all the answers

Which method was introduced in ES6 for performing exponential operations?

Exponential operator '**' Signup and view all the answers

What can be used to define asynchronous behavior in a function as per ES6?

async keyword Signup and view all the answers

Which method allows updating the content of an HTML element?

innerHTML Signup and view all the answers

Which new data structure introduced in ES6 enables the creation of collections of unique values?

Sets Signup and view all the answers

In JavaScript, how are integers represented?

As both integers and floating-point values Signup and view all the answers

What is the purpose of the Same-Origin Policy in JavaScript?

To restrict access across domains for security reasons Signup and view all the answers

Which of the following output methods overwrites the document post-load?

document.write() Signup and view all the answers

What type of values does a Boolean represent in JavaScript?

True or false values Signup and view all the answers

Which method is primarily used for debugging in JavaScript?

console.log() Signup and view all the answers

Which standard governs JSON in JavaScript?

ECMA-404 Signup and view all the answers

What does dynamic execution refer to in JavaScript?

JavaScript code adapting during runtime Signup and view all the answers

What is one primary function of mobile software?

To run on mobile hardware, including applications Signup and view all the answers

Which statement best describes mobile communication?

It represents the infrastructure for reliable communication. Signup and view all the answers

What notable device was released in 1981, marking a significant development in mobile computing?

Osborne 1 Signup and view all the answers

Alan Kay envisioned a portable computer in the 1970s. What was the name of this concept?

Dynabook Signup and view all the answers

Which of the following best captures the essence of mobile computing?

Allowing seamless operation without fixed physical links. Signup and view all the answers

What does full-duplex operation in mobile devices enable?

Simultaneous sending and receiving of signals. Signup and view all the answers

Which term describes devices like laptops and smartphones that enable mobile computing?

Mobile Hardware Signup and view all the answers

What is a significant characteristic of the mobile devices mentioned?

They facilitate wireless communication features. Signup and view all the answers

What is the primary focus of usability in UX design?

Removing unnecessary complexity to allow users to focus on essential functions Signup and view all the answers

Which principle is NOT associated with good UX design?

Ambiguity Signup and view all the answers

What does the Array.prototype.flat() method accomplish?

It flattens an array recursively up to a specified depth Signup and view all the answers

Which of the following best describes feedback in UX design?

Informing users about the outcomes of their actions within the product Signup and view all the answers

What is meant by consistency in UX design?

Maintaining uniformity in design elements across an interface Signup and view all the answers

How does the trimStart() and trimEnd() methods enhance user experience?

By simplifying string handling by removing unnecessary whitespace at both ends Signup and view all the answers

What is the purpose of the ECMA association?

To develop and publish standards for information and communication systems. Signup and view all the answers

Which version of ECMAScript introduced features such as arrow functions and classes?

ES6 Signup and view all the answers

What is the significance of the Optional Catch Binding feature in JavaScript?

It provides an option to not bind the caught error in a catch clause Signup and view all the answers

What major enhancement was provided by ECMAScript 3 in 1999?

Support for regular expressions and improved string manipulation. Signup and view all the answers

Which of the following is NOT a core principle of UX design?

Encourage users to learn extensively to use the product Signup and view all the answers

What was clarified by ECMAScript 2 regarding code interpretation?

Whitespace and comments should be treated consistently across implementations. Signup and view all the answers

Which of the following features is NOT associated with ECMAScript 1?

Support for asynchronous promises. Signup and view all the answers

What programming language standard does ECMA-334 refer to?

C# Signup and view all the answers

What is a primary focus of ECMAScript 1 released in 1997?

Basic control structures and data types. Signup and view all the answers

Which statement is true about the evolution of ECMAScript?

Each version contributes both enhancements and clarifications to the existing language. Signup and view all the answers

What is a potential health issue caused by excessive use of smartphones?

Brain tumors from electromagnetic radiation Signup and view all the answers

Which psychological effect is associated with overuse of mobile devices?

Loneliness and self-centeredness Signup and view all the answers

What social consequence can result from over-reliance on smartphones?

Strain on family relationships Signup and view all the answers

What is a potential result of children being exposed to inappropriate content on the internet?

Negative impact on mental and physical growth Signup and view all the answers

Which health issue is commonly associated with prolonged smartphone use regarding physical ailments?

Increased eye strain and retinal damage Signup and view all the answers

What is the key takeaway regarding mobile computing?

Self-discipline is necessary to mitigate the drawbacks. Signup and view all the answers

Which of the following is a consequence of excessive online presence?

Decreased real-life interactions Signup and view all the answers

What potential danger is associated with mobile computing?

Increased vulnerability to cybercrimes Signup and view all the answers

Study Notes

Mobile Computing Reviewer

Definitions
- Computing: The operation of computers, according to the Oxford Learner's Dictionary.
- Mobile: Easily movable from place to place.
Mobile Computing
- Enables users with portable computers to maintain network connections while moving.
- Data, voice, and video transmission is possible via wireless-enabled devices without a fixed physical link.
- Includes devices like laptops, smartphones, tablets, and PDAs.

Mobile Hardware

Includes mobile devices (laptops, smartphones, tablets, and PDAs).
Features receptor media sensing and receiving signals.
Operates in full-duplex mode, sending and receiving simultaneously.

Mobile Software

Software running on mobile hardware (operating systems and applications).
Enables users to operate from anywhere, incorporating wireless communication features.

Main Concepts in Mobile Computing

Mobile Communication: Infrastructure put in place ensuring reliable seamless communication, including protocols, bandwidth, services, and portals.
- Media is unguided/unbounded.

History of Mobile Computing (1970s - 1990s)

1970s: Alan Kay envisioned the portable computer "Dynabook" at Xerox PARC.
1981: Osborne 1, the first consumer laptop, was released, although with limitations.
1983: Kyocera Kyotronic was a widely used early laptop; the GriDPad was considered the first tablet.

Mobile Computing Reviewer (page 2)

1990s: Intel's mobile-specific processors improved battery management. PDAs (Newton MessagePad and PalmPilot) became dominant. IBM Simon was the first smartphone.
2000s: Microsoft introduced the Pocket PC. Apple launched the iPhone and Google introduced Android.
2010s: Rise of mobile operating systems like iOS and Android. Mobile payments and 4G networks became prevalent. Introduction of foldable phones and augmented reality (AR).
2020s: Expansion of 5G networks, AI-powered cameras, and emphasis on sustainability efforts.

Advantages & Disadvantages of Mobile Devices

Advantages: Always with the user, internet access, cameras, microphones, free or low-cost apps.
Disadvantages: Limited battery life, awkward input methods, platform diversity, and limited processing speed.

Top Trends in Mobile Computing

Tailor-made experiences.
Globalization of apps.
Narrow target audience for specific applications (niche apps).
Internet of Things approach (mobile apps as gateways).
Freemium models.

Mobile Systems Reviewer (page 3)

Mobile System Overview: Consists of mobile devices, mobile operating systems and Wireless Networks.
Mobile Devices: Hardware like CPU, memory, storage, similar to desktops, but with lower performance.
Mobile Operating System (Mobile OS): Platforms including iOS, Android, Windows Phone, Blackberry, etc., that manage devices' radio communication.
Wireless Networks: Mobile devices connect to the internet and communicate through cellular networks and Wi-Fi.
Mobile Apps: Programs for mobile devices, distributed through platforms (App Store, Google Play, etc.).

Wireless Networks

Cellular Networks: Connects mobile devices to cell sites/base stations for internet access.

Wireless Networks (cont.)

Wi-Fi: Local area wireless technology (2.4 GHz or 5 GHz bands). Allows communication without direct connection to a wired network, enables a cheaper deployment of local area networks (LAN). Uses WPA2 encryption for security.

Mobile Computing Reviewer (page 4)

Mobile Cloud Computing: Combines cloud computing, mobile computing, and wireless networks. Addresses limitations in resources and computational ability by offloading processes to the cloud.
Impact on Families and Social Life: Over-reliance on smartphones can strain family relationships, reducing quality time.
Mobile Technology - Growth and Reach: 96% of the global population had mobile subscriptions by 2013; 7 billion subscriptions. Smartphones were 50% of sales. Mobile subscriptions expected to hit 4.5 billion by 2018. Mobile broadband is growing faster than fixed broadband.
Performance, Energy: Optimize algorithms for better balance between battery life and performance.

Mobile Computing Reviewer (page 5)

Health Issues: Electromagnetic radiation from heavy internet use may cause brain tumors and skin cancer. Screen emissions can cause severe eye strain and retinal damage.
Psychological Impact: Excessive online presence reduces real-life interactions and experiences, leading to potential loneliness, self-centeredness, and trust issues.
Impact on Families and Social Life: Over-reliance on smartphones can strain family relationships and reduce quality time.
Internet Dangers: Children's mental and physical growth can be impacted by exposure to inappropriate content; risks of fraud, personal data leaks, potentially causing harm and stress.
Addiction and Overdependence: Excessive use may lead to distractions, particularly whilst driving, or dependence.
Real-Life Disconnect Emphasis on virtual interactions can diminish genuine experiences.

JavaScript Overview (page 6)

JavaScript: A popular dynamic programming language used for building interactive websites.

JavaScript Overview (cont.)

Capabilities and Restrictions: JavaScript can modify webpage content, handle interactions, and communicate with servers. Directly accessing files on a user's computer, interacting with the operating system, or engaging in cross-origin communication without permission is restricted.
Core Syntax: Variables (var, let, const), data types (primitive), and dynamic typing are fundamental elements in JavaScript.

Key Objects and Methods (page 7)

Strings: Declared with single or double quotes. Includes operations like addition, subtraction, and scientific notation.
Numbers: Contains integers and floating-point values.
Arrays: Collections of elements in square brackets, accessed by index.

Key Objects and Methods (cont.)

Booleans: True or false values for conditions.
Useful methods: innerHTML, document.getElementById(), document.write(), alert(), and console.log() are vital for output.

Advanced Concepts (page 8)

Dynamic Execution: JavaScript code adjusts during runtime.
Same-Origin Policy: Restricts access across domains for security purposes.

Summary (page 9)

ECMAScript: A standard for JavaScript. Specifics about the functionality and syntax of the language.

Additional Features (page 9-12)

Features: Modules, Template Literals, AdditionalString Methods, Array Improvements, String Padding, Promises, Generator, Sets, WeakSets, Maps, and WeakMaps.
ES Enhancements: Key additions and improvements to JavaScript since its initial inception. (e.g., Array.prototype.flat ,Optional Catch Binding, Object.values).

Modern JavaScript Features (pages 10 - 11)

Significant updates in recent versions of JavaScript (ES6+). Topics include: let and const, arrow functions, classes, async/await (ES8 and onwards), and more.

UI/UX (pages 12-13)

User Experience (UX) Principles Focuses on the ease of use and the experience users have with a product. This often uses concepts like usability, affordance, and consistency.
User Interface (UI) Principles: Visual aesthetic of a product which is part of the overall UX design.

Key Concepts in React (page 14)

React: A JavaScript library for creating user interfaces.
JSX: A syntax extension to JavaScript that enables writing HTML-like code.
Components: Reusable units for UI elements, improving efficiency in building interfaces.
Props: To pass data to components using JavaScript.
State: Manages data within a component.

React Advantages (page 15)

Performance, Reusable Components, Large Ecosystem, Platform Compatibility.
Real-world Examples: Explains how React is used in social media platforms, e-commerce sites, and streaming services.

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Description

Test your knowledge of key features introduced in JavaScript ES6 through ES9, including methods for asynchronous programming, data structures, and operator functionalities. This quiz covers essential concepts every JavaScript developer should know to effectively utilize modern JavaScript enhancements.