Loops are fundamental in programming as they allow you to execute a block of code multiple times. JavaScript provides several types of loops, each with its own use cases and syntax. In this section, we will cover the for, while, and do-while loops.

The for loop is commonly used when the number of iterations is known beforehand. It consists of three parts: initialization, condition, and increment/decrement.

• Initialization: let i = 0 initializes the loop counter i to 0.
• Condition: i < 5 checks if the loop counter is less than 5. If true, the loop continues; otherwise, it stops.
• Increment/Decrement: i++ increments the loop counter by 1 after each iteration.

Write a for loop that prints the numbers from 1 to 10.

The while loop is used when the number of iterations is not known beforehand and depends on a condition being true.

• Condition: i < 5 checks if the loop counter is less than 5. If true, the loop continues; otherwise, it stops.
• Code Block: The code inside the loop is executed as long as the condition is true.
• Increment/Decrement: i++ increments the loop counter by 1 after each iteration.

Write a while loop that prints the numbers from 1 to 10.

The do-while loop is similar to the while loop, but it guarantees that the code block is executed at least once before the condition is tested.

• Code Block: The code inside the loop is executed once before the condition is tested.
• Condition: i < 5 checks if the loop counter is less than 5. If true, the loop continues; otherwise, it stops.
• Increment/Decrement: i++ increments the loop counter by 1 after each iteration.

Write a do-while loop that prints the numbers from 1 to 10.

• Infinite Loops: Ensure that the loop condition will eventually become false; otherwise, you will create an infinite loop.

  // Infinite loop example
  let i = 0;
  while (i < 5) {
      console.log(i);
      // Missing i++ will cause an infinite loop
  }
  

• Off-by-One Errors: Be careful with the loop boundaries to avoid off-by-one errors.

  // Off-by-one error example
  for (let i = 0; i <= 5; i++) {
      console.log(i); // This will print 0 to 5, not 0 to 4
  }
  

In this section, we covered the basics of loops in JavaScript, including the for, while, and do-while loops. Each loop type has its own use cases and syntax, and understanding them is crucial for writing efficient and effective code. Practice writing different types of loops to become comfortable with their syntax and behavior. In the next section, we will explore switch statements, another control structure used for decision-making in JavaScript.