JavaScript Fundamentals for Back-End Development

Topic Outline (30-min)

1. JavaScript Syntax and Key Features:

   • JavaScript is case-sensitive and uses semicolons (optional but recommended for clarity).

   • Statements are executed line by line and grouped into blocks using {}.

2. Variables, Data Types, and Operations:

   • Declare variables using let, const, and var (avoid var for modern code).

   • Primitive data types: string, number, boolean, undefined, null.

   • Complex types: objects, arrays.

   • Example:

     javascript코드 복사let name = "John";
     const pi = 3.14;
     let isActive = true;

3. ES6+ Features:

   • Destructuring:

     javascript코드 복사const [a, b] = [10, 20];
     const {name, age} = {name: 'Alice', age: 25};

   • Template Literals:

     javascript코드 복사const message = `Hello, ${name}! Welcome back.`;

   • Arrow Functions:

     javascript코드 복사const square = (x) => x * x;

4. Conditional Statements and Loops:

   • Conditional statements:

     javascript코드 복사if (age > 18) {
       console.log('Adult');
     } else {
       console.log('Minor');
     }

   • Loops:

     javascript코드 복사for (let i = 0; i < 5; i++) {
       console.log(i);
     }

5. Debugging and Linting JavaScript Code:

   • Use console.log() for debugging.

   • Use linting tools like ESLint to enforce coding standards.

6. The Math and Date Objects:

   • Perform mathematical operations:

     javascript코드 복사console.log(Math.sqrt(16)); // 4

   • Work with dates:

     javascript코드 복사const today = new Date();
     console.log(today.toDateString());