Programming in Functional Style with Java 8 Lambdas
Venkat Subramaniam
venkats@agiledeveloper.com
twitter: @venkat_s
http://www.agiledeveloper.com/downloads.html

✓ Why Functional Programming?
	✓Growth of computer applications
	✓Two kinds of complexity
	✓Power and perils of OO and mutable state
	✓Emergence of multiple cores
✓ What's wrong with mutable state?	
  ✓ Error prone
  ✓ Hard to reason
  ✓ Hard to make concurrent	
✓ What's Functional Programming?
 ✓ What's old is new again
 ✓ Assignment-less programming
 ✓ Immutable state
 ✓ Functions as first class citizens
    ✓ Higher-Order functions
 ✓ Functions with no side-effect
✓What are the benefits?
✓Functional Style vs Purely functional
 ✓ a look at the languages
✓What does it really mean to code in functional style?
	✓state transformation instead of state mutation
✓Imperative vs. declarative
✓ Double values in a collection in Java—imperative style
✓ Double values in a collection in Java—declarative style
✓ Total double of values imperative style
✓ Total double of values functional style
✓ Declarative is expressive
  ✓ Tell me what, not how
  ✓ print names in uppercase - imperative
  ✓ print names in uppercase - declarative
✓Imperative vs Declarative
  ✓ how               what
  ✓ mutate	          transform
  ✓ side-effect       pure
  ✓ pass objects      pass functions also
  ✓ hard to compose   functional composition
✓ Programming with higher order functions
  ✓ total all values
  ✓ total select values - violation of DRY
  ✓ removing duplication with the strategy pattern
✓ Using higher order functions to build fluent interfaces
✓ Execute Around Method Pattern
✓ Function composition
✓ Imperative style to total value of assets
✓ Functional style to total value of assets
✓ Parallelizing2 the total value of assets

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