Collections Archive

Collections in Java

Arrays are used in java to store several objects. The issue with array is that it does not support dynamic allocation. It has a fixed length which is not changeable once it is declared. Moreover, array is a very simple linear structure and many applications require more flexible and complex structure such as linked list,

NodeJS – select data from mongoDB collection

Suppose we have a collection in MongoDB database, We want to select data from collection then we can do like the program below. Suppose we have a collection ( Like table in Relational DBMS)  named grades and this collection is in course database.   Grades collection contains fields like _id, student, grade and so on…  now