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variable # JavaScript

# Web Site Writing Basics

# javascript # variable

Variables in JavaScript are storage boxes used to store values that can be cited and used in programs. 📦

It's like labeling a box to hold things. Here, "box" is a variable and "thing" is a data value (e.g. numbers, text, logic).

Declaration of variables in JavaScript

Declaring variables in JavaScript can be done using three major keywords, each of which has different functional characteristics and scope (Scope):

1. Let

❇ Use for: Declare a variable whose value can be changed later

❇ Scope (Scope): It is a Block Scope type, meaning that the variable will be accessible only within the code block ({}) being declared.

❇ Example:

JavaScript

Let age = 30;

Age = 31; / / can change the value.

2. Const

❇ Use for: Declare Constant (Constant), which must default immediately and cannot be changed later

❇ Scope (Scope): It's a Block Scope type, just like let

❇ Example:

JavaScript

Const PI = 3.14159;

/ / PI = 3.14; / / An error will occur because the const cannot be changed.

❇ ⚠️ Exception: For Objects and Arrays declared with that const, the values inside Object or Array can also be changed (but not all new variable values can be configured)

3. Var

❇ Use for: It is an old-style keyword used to declare variables (before the ES6 / ES2015 era)

❇ Scope (Scope): It is Function Scope or Global Scope, which is overly flexible and can easily lead to errors.

❇ Instructions: To write modern JavaScript code, let and const are recommended instead of var to control the scope of variables more clearly.

2025/9/30 Edited to

... Read moreใน JavaScript นอกจากการประกาศตัวแปรด้วย let, const และ var แล้ว การเข้าใจเกี่ยวกับชนิดข้อมูลและวิธีการจัดการตัวแปรจะช่วยเพิ่มประสิทธิภาพในการเขียนโปรแกรมอย่างมาก ตัวแปรใน JavaScript สามารถเก็บข้อมูลได้หลายประเภท ได้แก่ ตัวเลข (Number), ข้อความ (String), ค่าตรรกะ (Boolean), อ็อบเจ็กต์ (Object), และอาเรย์ (Array) ซึ่งแต่ละประเภทสามารถนำไปใช้เพื่อแก้ไขปัญหาหรือพัฒนาฟังก์ชันต่าง ๆ ได้ ตัวอย่างเช่น การใช้ตัวแปรชนิดอาเรย์เพื่อเก็บรายการข้อมูล หรือใช้วัตถุเพื่อจัดเก็บข้อมูลหลายๆ ตัวในที่เดียว นอกจากนี้ ขอบเขตของตัวแปร (Scope) ถือเป็นสิ่งสำคัญที่ต้องเข้าใจ เพราะส่งผลต่อการเข้าถึงและการทำงานของตัวแปรในโปรแกรม ตัวแปรที่ประกาศด้วย let และ const จะมีขอบเขตแบบ block scope คือจะใช้ได้เฉพาะในบล็อกที่ประกาศเท่านั้น การใช้ scope แบบนี้ช่วยลดความผิดพลาดที่เกิดจากตัวแปรชนิดเดียวกันถูกประกาศซ้ำหรือใช้ผิดที่ ส่วน var มีขอบเขตแบบ function scope ซึ่งอาจส่งผลให้เกิดปัญหาด้านความชัดเจนของตัวแปร ถ้าไม่ระมัดระวัง การใช้ let และ const จึงถือเป็นแนวทางที่แนะนำใน JavaScript สมัยใหม่ เพราะช่วยให้โค้ดปลอดภัยและดูแลรักษาง่ายขึ้น เมื่อพูดถึง const ซึ่งเป็นค่าคงที่นั้น ควรจำไว้ว่าถึงแม้ตัวแปรจะไม่สามารถเปลี่ยนแปลงค่าตัวแปรได้โดยตรง แต่ถ้าเป็นอ็อบเจ็กต์หรืออาเรย์ที่ประกาศด้วย const ข้อมูลภายในยังสามารถเปลี่ยนแปลงหรือปรับปรุงได้ตามต้องการ นี่เป็นความสามารถพิเศษที่ผู้พัฒนาควรรู้เพื่อใช้ประโยชน์จาก const อย่างถูกต้อง ท้ายที่สุด การฝึกปฏิบัติและทดสอบการประกาศตัวแปรในโปรแกรมจริงจะช่วยให้เข้าใจการทำงานของแต่ละชนิดตัวแปรได้ชัดเจนขึ้น การเขียนโค้ด JavaScript อย่างมีประสิทธิภาพรวมถึงการเลือกใช้ตัวแปรชนิดที่เหมาะสมและการควบคุมขอบเขตตัวแปรจะช่วยลดบั๊กและทำให้โปรแกรมทำงานได้อย่างราบรื่น

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🎓Correlation is Not Causality, Not Even Close
📝What is correlation Correlation is a statistical measure that quantifies the degree and direction of the linear relationship between two or more variables. It provides valuable insights into how variables move in relation to one another. The correlation coefficient ranges from -1 to +1.
Capital&Crypto

Capital&Crypto

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This chart illustrates the IEEE Spectrum's Top-10 Programming Languages rankings from 2018 to 2024. Python consistently holds the top spot, while Java, C, C++, and JavaScript remain strong. The chart also shows the emergence and rise of languages like SQL and TypeScript over these years.
Top programming language evolution
This chart shows how top-10 programming languages have changed over the years. It highlights Python’s consistent dominance while Java, C, C++, and JavaScript remain strong, with newer contenders like SQL and TypeScript rising in recent years 😎👆 #programming #coding #upskill #tech #softw
Learn Linux with Dan

Learn Linux with Dan

7 likes

An iPad displays a PDF on recursive programming, with a colorful keyboard and stylus. The image highlights a study tool for students, featuring the UPDF app icon and suggesting it's an essential study aid.
An iPad shows a PDF document alongside an AI assistant panel summarizing 'recursion in JavaScript'. Text indicates the AI can summarize entire PDFs and answer questions based on the material.
An iPad displays a scanned handwritten note converted to PDF, demonstrating how to turn physical paper into digital files for annotation, comparison, or editing. A physical notebook is also visible.
Study smarter not hard 🌸
Hey besties! Struggling with studying this semester? Let me show you how to work smarter, not harder. If you’ve got an iPad or laptop, you NEED to check out UPDF—this AI-powered PDF editor is a game-changer! Here’s why: ❤️ Annotation: Highlight, underline, and add notes to your PDFs—perfect for
Byaombe •••

Byaombe •••

96 likes

A desk setup with a computer monitor and keyboard displays the title "FREE ONLINE CERTIFICATIONS to boost your resume" for 2023, with a Lemon8 watermark.
A laptop screen shows the Hubspot Academy website, detailing the free Inbound Marketing Certification course with options to sign up via Google or Microsoft.
A laptop screen displays the Google Skillshop website, showcasing various Google Ads Certifications with options to learn, apply skills, and get certified.
FREE Online Certifications 2023 💻
Boost your resume with these FREE online certifications! You can add them to your resume or LinkedIn profile, discuss them in an interview or just use them to upskill and reskill yourself to keep pace with today’s ever-changing economy. ‌> Hubspot’s Inbound Marketing Certification: Gain kno
hannah 💟

hannah 💟

11.3K likes

A desk setup featuring a Dell monitor, a white CHERRY keyboard, and a pink mouse, with the text overlay "easy coding projects for beginners" and a "LEARN MORE" button.
A white note card listing "Easy coding projects for beginners" including a to-do list app, personalized calculator, weather app, and simple quiz game, with descriptions for each.
An outdoor scene with a wide road lined by palm trees and buildings under a clear blue sky, with the text overlay "Comment 💻 if you'll try these projects!"
Easy Coding Projects!!
If you want to learn how to code then these are the perfect beginner projects! Here are some fun and easy projects to build your skills: To-Do List App: Create a simple app where you can add, edit, and delete tasks—perfect for practicing JavaScript or Python. ✅ Personalized Calculator: Build a
CompSkyy

CompSkyy

172 likes

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