An example of a codeblock for Python:

1# Function to add two numbers
2def add_two_numbers(num1, num2):
3    return num1 + num2
4
5# Example usage
6result = add_two_numbers(5, 3)
7print('The sum is:', result)

Example codeblock for JavaScript with lines highlighted:

1// Function to concatenate two strings
2function concatenateStrings(str1, str2) {
3  return str1 + str2;
4}
5
6// Example usage
7const result = concatenateStrings("Hello, ", "World!");
8console.log("The concatenated string is:", result);