Concepts What is a Promise | JavaScript A Promise is an object that represents an eventual outcome (success or failure) of an asynchronous operation and its resulting value. A promise is basically a placeholder for a value (outcome of operation) or an error (reason for failure) that we will receive at some point in the future, but
JavaScript What is a Hash Map Data Structure | JavaScript Hash Map is a non-linear data structure in computer science. Hash Maps act like key-value stores and are very efficient at saving and retrieving data. Hash Mapshash function - converts a key into an index within the hash map's underlying arrayhash collision - happens when a hash function returns the
JavaScript What is a Stack Data Structure | JavaScript Stack is a last in, first out (LIFO) data structure in computer science. Stack is a linear collection of ordered data (nodes). Stackspush - add data to the top of the stack (first/head node)pop - remove and return data (first/head node) from the top of the stackpeek
JavaScript What is a Queue Data Structure | JavaScript Queue is a first in, first out (FIFO) data structure in computer science. Imagine a line up at your favourite restaurant that works on first come, first serve basis. The first person to enter the line up, would be the first one to enter the restaurant. The last person to
