## Ruby on Rails Tip: add methods to object via #extend

Use **#extend** on an object to add/override methods of a specific object.

Use **#extend** on an object to add/override methods of a specific object.

Scrum is a framework (or tool sets) that helps teams to manage product development under Agile.

Summarize the tips on using ActiveRecord to speed up Ruby on Rails applications.

Ruby on Rails Interview experience for a big Sass company

Share the experience on applying for a larger startup with a very experienced Agile team.

Given a linked list, remove the nth node from the end of list and return its head.

An experience and some insight on doing startup developer interviews.

This post shares some job hunting experience and some insight about how to handle Ruby on Rails interviews.

Easy to understand algorithm's time and space complexity with big o notation.

Introduce fixed size array

A dynamically resizing array is an array that resizes itself as needed

Introduce string and string buffer

A basic linked list is a da data stucture of nodes in which every previous node has a reference to the next node.

A hash table is a data structure that maps keys to values for highly effient lookup.

A stack is a container of objects that are inserted and removed according to the last-in first-out (LIFO) principle.

A queue is a container of objects (a linear collection) that are inserted and removed according to the first-in first-out (FIFO) principle.

Representing a graph or tree by a matrix or adjacent node lists.

A tree is a data structure consisting of nodes organised as a hierarchy

A binary tree is a tree data structure in which each node has at most two children

Introduce the 3 types of Binary tree traversal - pre-order traversal, in-order traversal and post-order traversal.

Introduce the concept of BST and the related algorithms

A tree is height-balanced if the heights of the left and right subtree's of each node are within 1.

Introduce Complete Tree and Full Tree

The two main methods to traverse each node in a graph - Depth First Search and Breath First Search.

Introduce Bubble Sort

Introduce Selection Sort

Introduce Insertion Sort

Introduce Merge Sort

Introduce Quick Sort

Compares pros and cons of different sorting algorithms