Scala

Scala Doc

• STRING INTERPOLATION, https://docs.scala-lang.org/overviews/core/string-interpolation.html

s"Hello, ${name}"
"%s %s, age %d".format(firstName, lastName, age)
f"${row.getString(0)} $name is $age years old, and weighs $weight%.0f pounds."

All about Scala

• A general overview of Scala, http://allaboutscala.com/

01.Getting familiar with IntelliJ IDEA

02.Learning Scala: Fundamentals

• How To Use If Else Statement And Expression, http://allaboutscala.com/tutorials/chapter-2-learning-basics-scala-programming/scala-tutorial-use-if-else-statement-expression/

val numberOfDonutsToBuy = if(numberOfPeople > 10) (numberOfPeople * donutsPerPerson) else defaultDonutsToBuy

03.Thinking in terms of functions

04.Object Oriented using classes

05.Traits and Dependency Injection

06.Immutable Collection

07. Mutable Collection

★★★ 08.Collection Functions

09.Futures

10.Scala Test and Cheatsheet

11.Learn SBT

12.Learn Apache Spark 2

• Using StackOverflow dataset
• Add Apache Spark 2 SBT dependencies
• Bootstrap a SparkSession
• DataFrame Introduction
• Create DataFrame from a CSV file
• DataFrame schema
• Select columns
• Filter by column value
• Count rows
• SQL like
• Filter chaining
• SQL In
• SQL Group By

Scala Fish

• Loop, http://scala.wisdomfish.org/syntax/loop

for ( i <- 1 to 3) { println("Ho " + i) }
val result = for ( i <- 1 to 10 ) yield i + 2

alvin alexander

• https://alvinalexander.com/scala/
• How to prompt users for input from Scala shell scripts, https://alvinalexander.com/scala/scala-shell-scripts-how-prompt-users-input-read
• The Scala ternary operator syntax, https://alvinalexander.com/scala/scala-ternary-operator-syntax

val a = if (i == 1) x else y

Articles

• Scala中的None,Nothing,Null,Nil, https://blog.csdn.net/bluejoe2000/article/details/30465175