Kotlin is a relative newcomer from JetBrains and Android. It's intended to an improved version of Java, including Null Safety.
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fun double(x: Int): Int {
return 2*x
}
val x = 23
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"hello, " + double(3) + x
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val numbers: MutableList<Number> = mutableListOf(1, 4, 3)
val line = Line()
line.setY(numbers)
val plot = Plot()
plot.setTitle("Kotlin Plotting")
plot.add(line)
plot