This post demonstrates various code block examples with syntax highlighting. It's useful for testing how different programming languages are displayed in the blog.

// A simple JavaScript function to calculate factorial
function factorial(n) {
  if (n === 0 || n === 1) {
    return 1;
  }
  return n * factorial(n - 1);
}

// Example usage
const num = 5;
console.log(`The factorial of ${num} is ${factorial(num)}`);

// ES6 arrow function example
const square = (x) => x * x;
console.log(`The square of 4 is ${square(4)}`);

# A Python class example
class Calculator:
    def __init__(self, name):
        self.name = name
        self.result = 0
    
    def add(self, x, y):
        self.result = x + y
        return self.result
    
    def subtract(self, x, y):
        self.result = x - y
        return self.result
    
    def multiply(self, x, y):
        self.result = x * y
        return self.result
    
    def divide(self, x, y):
        if y == 0:
            raise ValueError("Cannot divide by zero!")
        self.result = x / y
        return self.result

# Create an instance and use it
calc = Calculator("MyCalculator")
print(f"Addition: {calc.add(10, 5)}")
print(f"Subtraction: {calc.subtract(10, 5)}")
print(f"Multiplication: {calc.multiply(10, 5)}")
print(f"Division: {calc.divide(10, 5)}")

#!/bin/bash

# A simple bash script to backup files

# Define variables
SOURCE_DIR="/path/to/source"
BACKUP_DIR="/path/to/backup"
DATESTAMP=$(date +"%Y-%m-%d")
ARCHIVE_NAME="backup_${DATESTAMP}.tar.gz"

# Create backup directory if it doesn't exist
if [ ! -d "$BACKUP_DIR" ]; then
  mkdir -p "$BACKUP_DIR"
  echo "Created backup directory: $BACKUP_DIR"
fi

# Create the archive
tar -czf "${BACKUP_DIR}/${ARCHIVE_NAME}" "$SOURCE_DIR"

# Check if backup was successful
if [ $? -eq 0 ]; then
  echo "Backup completed successfully: ${BACKUP_DIR}/${ARCHIVE_NAME}"
else
  echo "Backup failed!"
  exit 1
fi

# List existing backups
echo "Existing backups:"
ls -lh "$BACKUP_DIR"

• Add JavaScript code example
• Add Python code example
• Add Bash code example
• Add more programming languages

This post demonstrates how code blocks with syntax highlighting appear in the blog. The highlighting is handled by the highlight.js library that's included in the project.