1. /**
  2. * Asserts conditions on lists and logs errors if conditions are not met.
  3. *
  4. * @param {Array} list The list to validate.
  5. * @param {function} condition A function that takes a list and returns a boolean.
  6. * @param {string} message The error message to log if the condition fails.
  7. */
  8. function assertListCondition(list, condition, message) {
  9. if (!Array.isArray(list)) {
  10. console.error(`Error: Input must be an array. ${message}`);
  11. return;
  12. }
  14. if (typeof condition !== 'function') {
  15. console.error(`Error: Condition must be a function. ${message}`);
  16. return;
  17. }
  19. if (!condition(list)) {
  20. console.error(`Assertion failed: ${message}. List:`, list);
  21. }
  22. }
  24. /**
  25. * Example usage:
  26. */
  28. //Example 1: Check if all elements are positive numbers
  29. function allPositiveNumbers(list) {
  30. if (!Array.isArray(list)) return false;
  31. return list.every(item => typeof item === 'number' && item > 0);
  32. }
  34. assertListCondition([1, 2, 3, 4, 5], allPositiveNumbers, "All elements must be positive numbers.");
  35. assertListCondition([1, -2, 3, 4, 5], allPositiveNumbers, "All elements must be positive numbers.");
  36. assertListCondition([1, 2, 'a', 4, 5], allPositiveNumbers, "All elements must be positive numbers.");
  40. //Example 2: Check if list is sorted in ascending order
  41. function isSortedAscending(list) {
  42. if (!Array.isArray(list)) return false;
  43. for (let i = 0; i < list.length - 1; i++) {
  44. if (list[i] > list[i + 1]) {
  45. return false;
  46. }
  47. }
  48. return true;
  49. }
  51. assertListCondition([1, 2, 3, 4, 5], isSortedAscending, "List must be sorted in ascending order.");
  52. assertListCondition([1, 2, 5, 4, 3], isSortedAscending, "List must be sorted in ascending order.");
  53. assertListCondition([], isSortedAscending, "List must be sorted in ascending order.");

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