Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Problem: List Reverse in JavaScript

Given a list:

var list = { value: 1, next: { value: 2, next: { value: 3, next: null    
} } };

Reverse the order of the list so that it looks like:

var list = { value: 3, next: { value: 2, next: { value: 1, next: null } } };

Use the following shell if needed:

function reverseList(list) {
// your code here
...
return reversedList;
}

Example Test Case(s):

Arguments: { value: 1, next: { value: 2, next: { value: 3, next: null } } };
Returns: { value: 3, next: { value: 2, next: { value: 1, next: null } } };

Arguments: { value: "a", next: { value: "b", next: { value: "c", next: null } } };
Returns: { value: "c", next: { value: "b", next: { value: "a", next: null } } };

Requirements:

  • You cannot use the built-in reverse() function.
  • null is non-existent object, you may use an empty object instead if desired.
  • Your function should be able to reverse a list of values of any type.
  • You must use at least one array to solve the problem.

Hints:

  • Try breaking down the problem into multiple functions based on the exercises from the textbook code sandbox problems. The following would potentially be the functions in your program:
    • Turn the list into an array -> listToArray(...)
    • Reverse the array -> reverseArray(...)
    • Turn the array into a list -> arrayToList(...)
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