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Variable name in JavaScript

# Web Site Writing Basics

# variable # javascript

In JavaScript, there are important rules and rules:

# # Variable naming rules in JavaScript

These rules are what must be followed in order for the code to work and not cause errors:

1. * * Must begin with: * * Letter (A-Z, a-z), Dollar sign (* * $* *), or underline (* *\ _ * *).

* * * Valid example: * * 'myVariable', '_ total', '$price'

* * * Wrong example: * * '1stValue' (beginning with numbers)

2. * * can have: * * letters, numbers (0-9), dollar sign, and underline.

* * * Valid example: * * 'itemCount10', 'user _ name'

3. * * Do not use Reserved Keywords: * * You cannot use words used by JavaScript for specific purposes such as' for ',' while ',' if ',' else ',' function ',' let ',' const ',' var ',' class', 'return', etc., as variable names.

4. * * JavaScript is sensitive to case-small (Case-Sensitive): * * This means that 'myVariable' and 'MyVariable' are considered different variables.

---

# # Recommended Naming Conventions

Although it is a valid name according to grammar rules, to keep the code easy to read and standardized, most JavaScript developer communities recommend the use of these naming schemes:

# # # 1.Camel Case (for variables and functions) 🐫

Here are the most commonly used formats in JavaScript for variables and function names:

* Start with lowercase letters

* Every next word, start with capital letters.

| format | example | reason |

|: --- |: --- |: --- |

| * * Camel Case * * | 'FirstName', 'CalculateTotalPrice', 'isLoggedIn' | * * Main Standard: * * Make it easy to read when multiple words are available to each other and acceptable in the JavaScript community |

# # # 2.Pascal Case (For Class) 📐

Used for naming * * Class * * (class) or * * Constructor * * (object creation function):

* All words begin with capital letters, including the first word.

| format | example | reason |

|: --- |: --- |: --- |

| * * Pascal Case * * | 'UserModel', 'CarFactory', 'HttpRequest' | * * Secondary Standard: * * distinguish between common variable / function and class |

# # # 3.All Caps (For Unchanged Constants) 💎

It is used to name defined constants and will not change throughout the operation (e.g. mathematical values, non-changing URLs).

* Every letter is capitalized.

* Separate words by underscore (* *\ _ * *)

| format | example | reason |

|: --- |: --- |: --- |

| * * All Caps * * | 'MAX _ USERS', 'PI', 'API _ KEY' | * * Secondary Standard: * * Explicitly demonstrated as an All-Over Level Constant (Global Constant) |

---

# # Summary of good naming principles

* * * Emphasize meaning: * * The variable name should convey a clear meaning of what the variable stores, for example, instead of using 'x', use 'studentAge' or 'dataCount'.

* * * Avoid unclear abbreviation names: * * Do not use abbreviations that are not commonly known, e.g. instead of using 'clc', use 'computation' or 'computational'.

* * * Use a consistent format: * * Use primarily Camel Case for all variables and functions in your project to make the code look tidy and easy to maintain.

2025/10/1 Edited to

... Read moreจากประสบการณ์การเรียนรู้และใช้งาน JavaScript ผมพบว่าการตั้งชื่อตัวแปรให้ถูกต้องตามกฎและนิยามที่ชุมชนนักพัฒนาคอนเฟิร์ม จะช่วยลดข้อผิดพลาดและทำให้โค้ดสามารถบำรุงรักษาได้ง่ายขึ้น หลายครั้งที่ผมเห็นนักพัฒนาใหม่ตั้งชื่อตัวแปรแบบไม่สอดคล้องกัน เช่น ใช้ตัวพิมพ์ใหญ่เล็กสลับกัน หรือตั้งชื่อตัวแปรที่ไม่สื่อความหมาย ส่งผลให้เวลาอ่านโค้ดยากและแก้ไขทีหลังสับสน จึงอยากแนะนำให้ใช้ Camel Case กับตัวแปรและฟังก์ชัน เพราะเป็นมาตรฐานที่ยอมรับอย่างกว้างขวางใน JavaScript และช่วยให้ชื่อดูสวยงาม อ่านง่าย เช่น userName หรือ calculateSum การแยกความแตกต่างให้ชัดเจนกับคลาสโดยใช้ Pascal Case อย่างเช่น UserModel ก็เป็นอีกวิธีที่ดี สำหรับค่าคงที่จะต้องเขียนตัวอักษรใหญ่ทั้งหมดและใช้ขีดเส้นใต้ เช่น MAX_SIZE หรือ API_KEY เพื่อแสดงว่านี่คือค่าที่ไม่ควรแก้ไขในโค้ด นอกจากจะช่วยให้โค้ดสะอาดแล้ว การตั้งชื่อที่ดีทำให้ทีมงานทำงานร่วมกันได้รวดเร็วและลดความผิดพลาดจากการเข้าใจผิดเกี่ยวกับข้อมูลที่เก็บในตัวแปรอีกด้วย อีกเรื่องที่ผมพบเวลาทำงานกับตัวแปรใน JavaScript คือการระวังไม่ใช้คำสงวนที่ JavaScript กำหนดไว้ เช่น for, if, function เพราะจะทำให้โค้ดเกิดข้อผิดพลาดทันที สุดท้าย อยากแนะนำให้ตั้งชื่อตัวแปรที่สื่อความหมายดี เพราะช่วยให้เรากลับมาอ่านโค้ดในอนาคตได้เข้าใจอย่างรวดเร็วว่าแต่ละตัวแปรนั้นเก็บข้อมูลอะไรอยู่ เช่น แทนที่จะใช้ x หรือ data1 ควรใช้ studentAge หรือ userCount ที่บอกชัดเจนไปเลยครับ

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Essential JavaScript commands every developer needs! 🚀 Variables, functions, loops, arrays & DOM manipulation all in one quick reference guide. Perfect for coding interviews or daily development. Save this for later! 💾 #JavaScript #WebDev #Programming #Coding #Developer #JS #Code
EM

EM

1 like

A laptop displaying college statistics notes is open on a white desk, with a desktop monitor in the background showing the time and an inspirational quote. The notes on the screen cover probability concepts, including a binomial probability cheat sheet.
Detailed handwritten college statistics notes cover binomial and normal probability distributions. Topics include finding percentiles, calculating probabilities for various scenarios, and understanding sampling error, with examples and TI-84 calculator instructions.
Handwritten college statistics notes explain how to find the mean and standard deviation of random variables, identify distribution of sample means, and apply general addition and multiplication rules for probability, with various examples.
steal my college stats notes! pt. 2 💯📉📊
steal my college stats notes! pt. 2 💯📉📊 hello friends! here are some more notes from my college stats class last semester! because my professor let us bring a cheat sheet to class, i had to make sure my notes were clean. i needed to be able to flip through my notes and find each topic quickl
lia 💗

lia 💗

145 likes

Printable budget plannersAnd expense trackers
#biweeklybudget #lemon8challenge I know people especially the girls like to write out things , I know I do . Here are some expense trackers and budget planners you can save to your phone and print out. Or draw out I know I’ve done that before . But save this post so you can come back and look
🧿 Briana Jade Canter

🧿 Briana Jade Canter

49 likes

💵 Budget Creation Tips 💸
Here are 10 ways you can create a budget 1. Maximize Your Income: Let's start by turbocharging your total monthly income from all sources, including your salary, freelance gigs, and any sweet passive income streams. 2. Dominate Your Expenses: Keep a hawk-eye on all your spending for a mo
Shannon Yeh

Shannon Yeh

19 likes

The details of this planner
Living in Gods purpose has brought so much peace. Doing everything for His glory is a life like no other #faithplanner #christiandailyplanner #prayer and gratitude notebook #prayerfulplanner
Mida

Mida

88 likes

Caregiver Calm Tip: Fixed vs. Variable
#Caregiver #Calm #budget #money
Cynthia

Cynthia

3 likes

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