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Kotlin Compiler Options

$ kotlinc -X 2>&1 | grep -i release

Native Image

$ sdk u java graalvm-ce-dev
$ cat > App.kt << EOF
fun main() {
  println("Hello Kotlin!")
}
EOF

# $ kotlinc -version \
#           -verbose \
#           -include-runtime \
#           -java-parameters \
#           -jvm-target 19 \
#           -Xjdk-release=19 \
#           -api-version 1.9 \
#           -language-version 2.0 \
#           -Werror \
#           -progressive \
#           App.kt -d app.jar

$ kotlinc -version -include-runtime App.kt -d app.jar
$ java -showversion -jar app.jar
$ native-image \
      --no-fallback \
      --native-image-info \
      --enable-preview \
      -jar app.jar

$ chmod +x app
$ time ./app

# Static image info
$ file app
$ otool -L app
$ objdump -section-headers  app

# Find GraalVM used to generate the image
$ strings -a app | grep -i com.oracle.svm.core.VM

Videos

• https://www.youtube.com/watch?v=SEKsvHYZz8s (crypto 101)

Samples

fun main() {
  println("Hello, Kotlin!")
}

Eager style

if (true) {
    doThis()
}

Lazy/one-liner style

if (true) doThis()

Download movies.csv

Misc

classDiagram
    Animal <|-- Duck
    Animal <|-- Fish
    Animal <|-- Zebra
    Animal: +int age
    Animal: +String gender
    Animal: +isMammal()
    Animal: +mate()
    class Duck {
        +String beakColor
        +swim()
        +quack()
    }
    class Fish {
        -int sizeInFeet
        -canEat()
    }
    class Zebra {
        +bool is_wild
        +run()
    }

Math

$$ \begin{equation} x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \end{equation} $$