Tag Archives: Functional Programming

Functional Programming

Why Functional References are called “Lambda Expressions” in Java 8?

Many of us are very curious about the fact that why functional references introduced in Java 8 are know as Lambda Expressions. So let’s reveal the fact of word “Lambda Expressions” and make it very simple to understand.

This fact is very much related to the Evaluation process of any expression. Many of us may have solved the mathematical problems and while solving the problems we may have observed how we are reducing the mathematical expression to some values. Similarly we also may have observed in many programming languages how any expression is evaluated.

Java 8: Lambda Expressions

Java 8 is completing almost 2 years now and this topic is widely discussed on Internet now a days. Java was originally designed to work OOP as it was the primary paradigm for software development at that time. But today’s programming directed towards concurrent and reactive programming which focuses on functional modularity which is provided by functional languages like Scala.

Concept of functional programming is completely a new era for the hard core Java Programmers and lambda expressions are bridging OOP and FP by adding functional language capabilities to Java. You will find this concept roaming around anonymous classes and functional programming.

What do you mean by term “Syntactic Sugar”?

For many of us term Syntactic Sugar could be something out of this world and the term is too much heavy that anyone would wonder about this alien word. But many times the concept behind such terms is very simple. Now let’s make this word easily understandable. In such cases, I always split the term into separate words and try to understand the meanings of individual words in programming world prior to understand actual meaning the term.

So below is the diagram how I understand this term,

Introduction to Functional Programming

Before we understand practical capacities of Scala language or attempt to learn core ideas of lambda expressions in Java, it is more crucial to understand the concept of Functional Programming first.

Most of the popular programming languages (like C, C++ and Java) are primarily created to follow the methodology of Imperative Programming, which implies that programmer generally write a code block (sequence of statements) which will change the state of the program(value of the variables) as each line is executed step by step.

2 Ways of installing Java 8 on CentOS

Installing Java on CentOS is one of the easiest exercise ever. However, I’ll let you know two different ways in which Java can be installed on CentOS. We’ll take latest version of Java which is Java 8. Even you can combine all following steps in one shell script and can simply execute that shell script in order to install Java/JDK. Following steps are performed using root user you can also execute the steps with non root user having sudoer rights. Before moving towards installation process I have assumed that CentOS has wget command installed. If not than install it using below step.