Kotlin for Beginners: Immutability and the value of val

Transcript

1. IMMUTABILITY AND THE VALUE OF VAL MEDIUM.COM/@NICKSKELTON TWITTER.COM/@NSHRED WHILE YOU WAIT WHAT IS THE JAVA EQUIVALENT OF VAL?
2. WHAT DOES IMMUTABLE MEAN?
3. WHICH IS IMMUTABLE?
8. IMMUTABILITY IN KOTLIN. THE VALUE OF VAL PROS AND CONS ▸ Pros ▸ Multithreading. Thread safety. ▸ Cons ▸ Memory usage.
9. IMMUTABILITY IN KOTLIN. THE VALUE OF VAL WE NEED TO GO DEEPER ▸ Why we write Mutable code: ▸ We think in mutable constructs. ▸ In Java, final feels too verbose. ▸ Why immutable code is better: ▸ State. Have you turned it off and on again? ▸ Applies a limit, thereby forcing you to think.
10. USING VAL’S IN YOUR CODE MAKES YOU THINK ABOUT ALTERNATIVE, IMMUTABLE, FUNCTIONAL CODE. REMOVING VAR’S LEADS TO REFACTORING. THE REFACTORING LEADS TO NEW CODING PATTERNS. NEW CODING PATTERNS LEADS TO A SHIFT IN YOUR APPROACH TO PROGRAMMING. THIS SHIFT IN APPROACH LEADS TO TRANSFORMATIVE CODE THAT HAS FEWER DEFECTS AND IS EASIER TO MAINTAIN. — BEGINNING SCALA, DAVID POLLACK
11. USING VAL’S IN YOUR CODE MAKES YOU THINK ABOUT ALTERNATIVE, IMMUTABLE, FUNCTIONAL CODE. REMOVING VAR’S LEADS TO REFACTORING. THE REFACTORING LEADS TO NEW CODING PATTERNS. NEW CODING PATTERNS LEADS TO A SHIFT IN YOUR APPROACH TO PROGRAMMING. THIS SHIFT IN APPROACH LEADS TO TRANSFORMATIVE CODE THAT HAS FEWER DEFECTS AND IS EASIER TO MAINTAIN. — BEGINNING SCALA, DAVID POLLACK
12. USING VAL’S IN YOUR CODE MAKES YOU THINK ABOUT ALTERNATIVE, IMMUTABLE, FUNCTIONAL CODE. REMOVING VAR’S LEADS TO REFACTORING. THE REFACTORING LEADS TO NEW CODING PATTERNS. NEW CODING PATTERNS LEADS TO A SHIFT IN YOUR APPROACH TO PROGRAMMING. THIS SHIFT IN APPROACH LEADS TO TRANSFORMATIVE CODE THAT HAS FEWER DEFECTS AND IS EASIER TO MAINTAIN. — BEGINNING SCALA, DAVID POLLACK
13. IMMUTABILITY IN KOTLIN. THE VALUE OF VAL THE KOTLIN BEGINNER’S CHEAT SHEET Symbol Meaning !! Bang! Bang! Boom! ? seriously? var variety of problems val valuable code