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Logical / JavaScript Operator

# Web Site Writing Basics

# javascrip

# The logical operator

Logical Operators in JavaScript use Boolean: true or false) or to control the operation of conditions. They work on a principle called Short-Circuit Evaluation. This means that they may stop evaluating the remaining Operand as soon as the final result is known.

There are 3 main operators:

1. (OR: OR)

The OR operator is used to determine if a condition is true.

Truth table: It returns true if one or both operands are true.

Short-Circuit Operation:

It will evaluate the operand from left to right.

As soon as the first operand is found to be Truthy (considered true), it restores the value of that operand and stops evaluating.

If all operands were Falsy (considered false), it would restore the value of the last operand.

Example Results Reason

'True false. '

'0 5 '

'"null'

General benefit: Used to define Default Value if the first value is null or undefined.

JavaScript

let userName = userSetting | | 'Guest';

/ / If userSetting is null / undefined / "/ 0, userName is set to 'Guest'.

2. & & (AND: AND)

The AND operator is used to determine if all conditions are true.

Truth table: It returns true only if both sides of the operand are true.

Short-Circuit Operation:

It will evaluate the operand from left to right.

As soon as the first operand is found to be Falsy (considered false), it restores the value of that operand and stops evaluating.

If all operands were Truthy, it would restore the value of the last one.

Example Results Reason

The first true & & false false is true, but the second is false, thus restoring false (the second).

5 & & "Hello" "Hello" Both Are Truthy Restore Last

0 & & "World" 0 0 is Falsy immediately returns 0.

Typical Benefits: Used to Make Conditional Rendering or Call Conditional Functions (Used instead of Short If Structures)

JavaScript

/ / If isLogged is true, call the showProfile function.

isLogged & showProfile ();

3.! (NOT: NOT)

The NOT operator is used to reverse the logical value.

Operation: It will convert the operand into a logical value (Boolean) and then reverse it.

! True, false.

! False is true.

Example Results Reason

! True, false. Back up.

! 0 true 0 to Falsy was converted to false and then returned to true.

! "Hello" is true! The first converts "Hello" (Truthy) to false and the second back to true.

Export to sheet

General benefit: Used to verify whether a value is Falsy or Truthy (using!! to convert any value into an authentic Boolean).

Falsy and Truthy Values in JavaScript

In JavaScript logic valuation, the following values are assumed to be Falsy (equivalent to false):

False

0 (zero)

"" (empty string)

Null

Undefined

NaN (Not-a-Number)

Truthy is all other values that are not in the Falsy list (e.g. 1, "hello," [], {}).

2025/10/7 Edited to

... Read moreในบทความนี้เราจะเพิ่มเติมความเข้าใจเกี่ยวกับตัวดำเนินการทางตรรกศาสตร์ (Logical Operators) ใน JavaScript ที่แม้จะเป็นเรื่องพื้นฐานแต่ก็สำคัญมากในการเขียนโปรแกรมที่มีเงื่อนไขซับซ้อน นอกจากนี้ยังมีประเด็นที่หลายคนอาจสงสัยเกี่ยวกับข้อมูลชนิดข้อความ (string) กับการใช้งานตัวดำเนินการเหล่านี้ สิ่งที่อยากแชร์ก็คือการทำงานของตัวดำเนินการ OR (||) และ AND (&&) นอกจากจะช่วยให้เรากำหนดค่าตัวแปรเริ่มต้นได้แบบรวบรัดแล้ว ยังช่วยในกรณีของ Conditional Rendering หรือการเลือกทำงานในบางสถานการณ์อย่างมีประสิทธิภาพ เช่น ถ้ามีค่าของตัวแปรเป็น null หรือ undefined เราสามารถใช้ || กำหนดค่าเป็นค่า default ได้โดยไม่ต้องเขียนโค้ดยาวๆ ส่วนตัวดำเนินการ NOT (!) ก็มีประโยชน์มากในการตรวจสอบว่าค่าตัวไหนเป็น Falsy หรือ Truthy จึงช่วยลดความซับซ้อนในการเขียนเงื่อนไขและทำให้โค้ดอ่านง่ายขึ้นอย่างมาก นอกจากนี้ การเข้าใจเรื่อง Short-Circuit Evaluation ก็สำคัญไม่น้อย เพราะช่วยให้โค้ดที่เราเขียนทำงานได้รวดเร็วและไม่ต้องเสียเวลาในการตรวจสอบเงื่อนไขที่ไม่จำเป็น ในการใช้งานจริง ตัวอย่างเช่น การตรวจสอบสภาวะการล็อกอินผู้ใช้ ถ้าตัวแปร isLogged เป็น true ก็เพียงพอให้เรียกฟังก์ชันแสดงข้อมูลโปรไฟล์ได้ทันที โดยไม่ต้องใช้ if ซ้อนหลายชั้น ซึ่งช่วยให้โค้ดดูสะอาดและเข้าใจง่ายมากขึ้น สำหรับการประเมินค่าตรรกะใน JavaScript นั้น เราควรจดจำค่าที่ถูกมองว่าเป็น Falsy ซึ่งรวมถึง false, 0, "" (สตริงว่าง), null, undefined และ NaN ส่วนค่าที่เหลือจะถือเป็น Truthy ทั้งหมด ซึ่งความรู้ตรงนี้จะช่วยให้เราเขียนเงื่อนไขต่างๆ ได้อย่างถูกต้องและลดข้อผิดพลาด แนะนำว่าควรลองนำตัวดำเนินการเหล่านี้ไปใช้ในโปรเจกต์เล็กๆ หรือในโค้ดที่เขียนเองดู เพื่อเรียนรู้และเข้าใจพฤติกรรมของมันอย่างแท้จริง เพราะประสบการณ์ตรงจะช่วยให้เราเข้าใจแนวคิดและการนำไปใช้ได้ดีกว่าการอ่านอย่างเดียวแน่นอน

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A desk setup with a monitor displaying a SheCodes workshop on 'React States,' titled 'how i learned to code.' The image shows a keyboard, mouse, and speaker, with 'Upgrade your career' text, reflecting the user's coding journey with SheCodes.
How I learned to code
I enrolled in SheCodes last year and it has been the best decision that I have made regarding my career! 🌼I did their free class and I knew immediately I was a good fit. Starting out with basics I tested if my brain could work well with code and once I learned it did I moved on to the max progr
Realm of Comfort

Realm of Comfort

534 likes

Learn more. Spend $0.
Discover 5 websites to build your skills in coding, AI, and digital marketing—for free. Selected learning paths also offer free certificates or digital badges. Explore more at SmartNovaHub.com: tap the "smartnovahub.com" Link in my bio🔗 #FreeCourses #OnlineLearning #FreeCertif
smart nova hub

smart nova hub

1 like

Vocational Careers For YOU✨
Hey There✨ Vocational careers are focused on practical, hands-on skills and training for specific trades or professions. These careers typically require less time and financial investment than a traditional four-year college degree and are often taught at trade schools, community colleges, or th
Emilyyy

Emilyyy

96 likes

A tech career tip slide titled "FRONTEND DEVELOPER" with "What to study + free resources" and "SWIPE STEP BY STEP GUIDE." It shows a laptop on a desk with a lamp and plant, indicating a guide for aspiring developers.
A slide titled "1. Learn HTML, CSS, and JavaScript" with descriptions for each and study resources like freeCodeCamp and MDN Web Docs, set against a scenic coastal town backdrop.
A slide titled "2. Master Responsive Design and CSS Framework" explaining mobile-friendly designs and frameworks like Bootstrap or Tailwind CSS, with W3Schools and Bootstrap documentation as resources, against a sunny street scene.
How to become a Frontend developer 👩‍💻💰
1. Learn HTML, CSS, and JavaScript - What to study: Begin with HTML for structuring web pages, CSS for styling, and JavaScript for adding interactivity. - Free resources: Websites like freeCodeCamp and MDN Web Docs provide comprehensive lessons on these topics. - Why it’s important: The
vedha | career tips (tech) 👩‍

vedha | career tips (tech) 👩‍

23 likes

Never too old to learn!!! 🍋🥰🫶
silentmediaboss

silentmediaboss

5 likes

Automate your tests
#lemon8dairy #javascript #frontend #developer #ui #ux #html #CSS
SyntaxSidekick

SyntaxSidekick

0 likes

A laptop screen displays lines of code, with text overlayed saying 'free websites to learn coding' and 'new skill,' encouraging users to swipe for more information on learning to code during a study break.
A laptop screen shows code, overlaid with a pop-up featuring 'codecademy.com.' The pop-up highlights interactive coding courses and a sign-up form, promoting it as a free resource for learning various programming languages.
A laptop screen displays code, overlaid with a pop-up featuring 'freecodecamp.com.' The pop-up describes it as a nonprofit offering free comprehensive web development and data analytics curriculum, including certifications.
On a study break? Try to learn how to code! 👩🏻‍💻
Learning coding during a study break is a productive way to use your time. It provides a mental shift from regular studies, enhances problem-solving skills, and fosters creativity. Online coding platforms offer flexibility, allowing you to learn at your own pace. This makes coding an ideal acti
teal.days

teal.days

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