Scala Programming Introduction
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March 10, 2016 - Hadoop Meeting. Rajiv presentation on starting Scala @airisdata. An introduction to programming in SCALA from the REPL with live examples.
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- 3. Imperative Versus Functional Programming In imperative approach, a developer writes code that describes in exacting detail the steps that the computer must take to accomplish the goal. Functional approach involves composing the problem as a set of functions to be executed. “Pure Functions” makes the order of execution irrelevant - since no side- effect can change the value of an expression, it can be evaluated at any time. Characteristic Imperative approach Functional approach Programmer focus How to perform tasks (algorithms) and how to track changes in state. What information is desired and what transformations are required. State changes Important. Non-existent. Order of execution Important. Low importance. Primary flow control Loops, conditionals, and function (method) calls. Function calls, including recursion. Primary manipulation unit Instances of structures or classes. Functions as first-class objects and data collections.
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