Review of Iterations

Advantages of Loops in Programming

• Loops enhance code in several ways:
  • Enable handling of complex scenarios coherently.
  • Improve code extensibility, making updates easier.
  • Make code more succinct and readable.

DRY (Don't Repeat Yourself) Principle

• Loops exemplify the DRY principle, a core programming concept.
  • DRY discourages code repetition to reduce errors.
  • Loops are particularly effective in preventing repetition.
  • DRY will be revisited later in the context of methods and object unmutated design.

Choosing the Right Loop

• Selecting the appropriate loop can sometimes be confusing.

For Loops

• Use a for loop when the number of iterations is known.
• Ensure numeric data types and operators for:
  • Control variable
  • Threshold
  • Change
  • Operator
• Character types can be used, particularly in string sorting, but numeric types are generally simpler.
• Increment or decrement the control variable by one for simplicity.
• Carefully choose the operator to avoid off-by-one errors.
  • Accidentally including an equal sign can cause one extra iteration, leading to bugs or compile-time errors.

While Loops vs. Do-While Loops

• When the number of iterations is unknown, choose between while and do-while loops.
  • While loop: preferred as it can skip the body if the condition is initially false.
  • Do-while loop: always executes the body at least once.
• Include a change statement within the loop body to prevent infinite loops.
• In do-while loops, a semicolon is required at the end of the while statement.
  • Omitting the semicolon results in a compile-time error, as the compiler won't recognize the while statement as part of the do statement.