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Reading Time: 2 minutes Elasticsearch is a real-time distributed and open source full-text search and analytics engine. To integrate Elasticsearch to our application, we need to use an API. Elasticsearch gives us two ways, REST APIs, and Native clients. It’s easy to get confused about all the different ways to connect to Elasticsearch and why one of them should be preferred over the other. Available Elasticsearch clients are: Node Continue Reading
Reading Time: 6 minutes GraphQL is an API standard that provides a more efficient, powerful and flexible alternative to REST. It was created by Facebook in 2012 and was open-sourced in 2015 and is now maintained by a large community of companies and individuals from all over the world. GraphQL is just a specification, meaning it’s just a set of rules defined in a document. GraphQL is a query language designed Continue Reading
Reading Time: 6 minutes The central drive behind Scala is to make life easier and more productive for the developer — and that includes me. Scala does this with three principal techniques: It cuts down on boilerplate, so programmers can concentrate on the logic of their problems. It adds expressiveness, by tightly fusing object-oriented and functional programming concepts in one language. And it protects existing investments by running on Continue Reading
Reading Time: 5 minutes We grew up in a world of imperative programming that’s why we are more addictive to writing code in imperative style. Everything is mutable around us. Mutability is not that bad. But shared mutability is devil’s work. The moment we bring shared mutability all kinds of problem creep in. Functional Style has a way to handle this. Functional programming is a way of writing software Continue Reading
Reading Time: 5 minutes Slick stands for Scala Language-Integrated Connection Kit. It is Functional Relational Mapping (FRM) library for Scala that makes it easy to work with relational databases. Slick can be considered as a replacement of writing SQL queries as Strings with a nicer API for handling connections, fetching results and using a query language, which is integrated more nicely into Scala. You can write your database queries Continue Reading
Reading Time: 7 minutes There is a lot of buzz going on between when to use use spark, when to use flink, and when to use Kafka. Both spark streaming and flink provides exactly once guarantee that every record will be processed exactly once thereby eliminating any duplicates that might be available. Both provide very high throughput compared to any other processing system like storm, and the overhead of Continue Reading
Reading Time: 6 minutes Scala Map is a collection of Key-value pair. A map cannot have duplicate keys but different keys can have same values i.e keys are unique whereas values can be duplicate. Maps in Scala are not language syntax. They are library abstractions that you can extend and adapt. Scala provides mutable and immutable alternatives for maps. Class hierarchy for scala maps is shown below: Image Continue Reading
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