lesson 3 update
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@ -6,6 +6,8 @@ object AClass{
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val c = "c"
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}
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fun getAClass(): AClass? = null
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/**
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* [with]/[run]/[let] are used to create a scope with given argument or receiver
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*/
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@ -14,20 +16,20 @@ fun main() {
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println("a = ${AClass.a}, b= ${AClass.b}, c = ${AClass.c}")
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// Using `with`
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with(AClass){
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val res = with(AClass){
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// AClass type is the receiver in this scope
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println("a = $a, b= $b, c = $c")
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println("a = $a, b = $b, c = $c")
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return@with "some value"
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}
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//using `run`
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AClass.run {
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getAClass()?.run {
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// the same as above
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println("a = $a, b= $b, c = $c")
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}
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//Using `let` to compose result. Not recommended to use without a need
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val letResult = AClass.let {
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it.c + it.a
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val letResult = getAClass()?.let { arg ->
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arg.c + arg.a
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}
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}
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@ -17,6 +17,8 @@ fun main() {
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*/
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fun getAndIncrement() = i.also { i += 1 }
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println(getAndIncrement())
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/**
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* Configure properties of an object (apply)
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* https://kotlinlang.org/docs/idioms.html#configure-properties-of-an-object-apply
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@ -29,9 +29,12 @@ fun main() {
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val newList = list + "f" + mutableList
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println(newList)
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//Bonus
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val lambdaList = List(3){it.toString()}
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println(lambdaList)
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}
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/**
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@ -15,5 +15,11 @@ fun main() {
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println("$k -> $v")
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}
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val (a,b) = Pair(1, 2)
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map.forEach { (k, v) -> println("$k -> $v")}
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val (a, b) = Pair(1, 2)
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val coord = doubleArrayOf(0.0, 1.0, 2.0)
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val (x,y,z) = coord
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}
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@ -7,5 +7,5 @@ class AClassWithList{
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fun main() {
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val obj = AClassWithList()
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obj.list
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}
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@ -1,13 +1,17 @@
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@file:JvmName("Idiom26Kt")
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package lesson3
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import kotlin.math.PI
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import kotlin.math.sin
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fun main() {
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fun integrate(from: Double = 0.0, to: Double = 1.0, step: Double = 0.01, function: (Double) -> Double): Double {
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fun integrate(
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from: Double = 0.0,
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to: Double = 1.0,
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step: Double = 0.01,
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function: (Double) -> Double,
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): Double {
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require(to > from)
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require(step > 0)
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var sum = 0.0
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var pos = from
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while (pos < to) {
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@ -17,7 +21,9 @@ fun main() {
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return sum
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}
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integrate { x -> x * x + 2 * x + 1 }
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integrate { x ->
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x * x + 2 * x + 1
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}
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integrate(0.0, PI) { sin(it) }
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integrate(0.0, PI, step = 0.02) { sin(it) }
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}
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