In what situations is it advisable to avoid rewriting the same code?

Avoid rewriting the same code repeatedly in the following situations:

• When the same logic is used in multiple places in the project — it is better to extract it into a function or module to facilitate maintenance and updates.
• To reduce errors: changing code in one place automatically propagates to all calls.
• To improve code readability and structure.
• When working in a team — a single codebase is easier to test and document.

For example, if date formatting is needed in multiple places, it is better to write a single function:

function formatDate(date) {
  return date.toISOString().split('T')[0];
}

// Usage
console.log(formatDate(new Date()));

This simplifies maintenance and prevents duplication.