SSL Utils

A lightweight, beginner-friendly JavaScript library for working with Singly Linked Lists.

The goal of this project is to provide an easy-to-use implementation of a singly linked list with common operations while keeping the API simple and intuitive.

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✨ Features

Current version supports:

• ✅ Create a linked list from an array
• ✅ Convert linked list to an array
• ✅ Insert at front
• ✅ Insert at back
• ✅ Insert at any index
• ✅ Delete front node
• ✅ Delete last node
• ✅ Delete node at an index
• ✅ Delete first occurrence of a value
• ✅ Delete all occurrences of a value
• ✅ Delete the entire linked list
• ✅ Print linked list
• ✅ Convert linked list to string
• ✅ Get length of linked list

Upcoming features:

• ⬜ Reverse
• ⬜ Find
• ⬜ Middle
• ⬜ Sort

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Installation

npm install ssl-utils

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Usage

const { SinglyLinkedList } = require("ssl-utils");

Create a list from an array.

const list = SinglyLinkedList.from([10, 20, 30]);

console.log(list.toArray());
// [10, 20, 30]

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API

Create

SinglyLinkedList.from(array)

Creates a new linked list from an array.

const list = SinglyLinkedList.from([1, 2, 3]);

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Insert

insertFront(value)

Insert a node at the beginning.

list.insertFront(5);

Before

10 -> 20 -> 30

After

5 -> 10 -> 20 -> 30

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insertBack(value)

Insert at the end.

list.insertBack(40);

Before

10 -> 20 -> 30

After

10 -> 20 -> 30 -> 40

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insertAt(value, index)

Insert at any valid index.

list.insertAt(25, 2);

Before

10 -> 20 -> 30

After

10 -> 20 -> 25 -> 30

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Delete

deleteFront()

Deletes the first node.

list.deleteFront();

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deleteBack()

Deletes the last node.

list.deleteBack();

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deleteAt(index)

Deletes node at the given index.

list.deleteAt(2);

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deleteValue(value)

Deletes the first occurrence of the given value.

list.deleteValue(20);

Example

Before

10 -> 20 -> 30 -> 20

After

10 -> 30 -> 20

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deleteAllValues(value)

Deletes all occurrences of a value.

list.deleteAllValues(20);

Before

10 -> 20 -> 30 -> 20

After

10 -> 30

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deleteList()

Deletes the entire linked list.

list.deleteList();

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Conversion

toArray()

Returns an array representation.

list.toArray();

Output

[10, 20, 30]

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toString()

Returns a printable string.

list.toString();

Output

10 -> 20 -> 30

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print()

Prints the linked list.

list.print();

Output

10 -> 20 -> 30

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Length

length()

Returns the number of nodes.

console.log(list.length());

Output

3

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Example

const { SinglyLinkedList } = require("ssl-utils");

const list = SinglyLinkedList.from([10, 20, 30]);

list
    .insertFront(5)
    .insertBack(40)
    .insertAt(25, 3);

console.log(list.toString());

list.deleteFront();
list.deleteBack();
list.deleteValue(25);

console.log(list.toArray());

console.log(list.length());

Output

5 -> 10 -> 20 -> 25 -> 30 -> 40

[10, 20, 30]

3

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Error Handling

The library throws descriptive errors for invalid operations.

Examples:

• Input must be an array
• Value cannot be null or undefined
• Index must be a non-negative integer
• Index must be a non-negative integer and less than size
• List is empty
• Value not found in the list

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Supported Data Types

The linked list can store any JavaScript value, including:

• Integers
• Floating-point numbers
• Strings
• Booleans
• Objects
• Arrays
• Functions
• Custom classes

Example

const list = SinglyLinkedList.from([
    1,
    3.14,
    "SSL Utils",
    true,
    { id: 1 }
]);

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Testing

The project uses Jest for unit testing.

Run all tests:

npm test

Run tests with verbose output:

npm test -- --verbose

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Project Structure

ssl-utils
│
├── src
│   ├── Node.js
│   ├── SinglyLinkedList.js
│   └── index.js
│
├── tests
│
├── examples
│
├── README.md
├── LICENSE
├── package.json
└── .gitignore

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Contributing

Contributions, feature requests, bug reports, and improvements are welcome.

Feel free to fork the repository and submit a pull request.

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License

This project is licensed under the MIT License.

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Roadmap

Version 1.0.0

• ✅ Create from array
• ✅ Insert operations
• ✅ Delete operations
• ✅ Conversion utilities
• ✅ Length
• ✅ Print

Planned

• ⬜ Reverse
• ⬜ Find
• ⬜ Middle
• ⬜ Sort
• ⬜ Doubly Linked List support