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animation { 0.frame { x = 10 y = 20 } 50.frame { y = 70 rotation = 90 } 100.frame { x = 0 y = -20 rotation = 40 } }

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/** * Example of a higher-order function */ fun Iterable.map(transform: (T) -> R): MutableList { val destination = emptyMutableList() this.forEach { value -> // Invoke the transform function with the current value val transformedValue = transform(value) destination.add(transformedValue) } return destination }

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/** * Example of a higher-order function */ fun Iterable.map(transform: (T) -> R): MutableList { val destination = emptyMutableList() this.forEach { value -> // Invoke the transform function with the current value val transformedValue = transform(value) destination.add(transformedValue) } return destination }

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/** * Calls the specified function [block] with `this` value * as its receiver and returns `this` value. */ public inline fun T.apply(block: T.() -> Unit): T { contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) } block() return this }

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/** * Calls the specified function [block] with `this` value * as its receiver and returns `this` value. */ public inline fun T.apply(block: T.() -> Unit): T { contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) } block() return this }

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/** * Calls the specified function [block] with `this` value * as its receiver and returns `this` value. */ public inline fun T.apply(block: T.() -> Unit): T { contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) } block() return this }

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/** * Calls the specified function [block] with `this` value * as its receiver and returns `this` value. */ public inline fun T.apply(block: T.() -> Unit): T { contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) } block() return this }

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/** * Calls the specified function [block] with `this` value * as its receiver and returns `this` value. */ public inline fun T.apply(block: T.() -> Unit): T { contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) } block(this) return this }

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val user = User(name = "John", age = 30, city = "Berlin") user.apply { age = 31 city = "Hamburg" }

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val user = User(name = "John", age = 30, city = "Berlin") user.apply { this.age = 31 this.city = "Hamburg" }

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animation { // This is a higher-order function 0.frame { x = 10 y = 20 } 50.frame { y = 70 rotation = 90 } 100.frame { x = 0 y = -20 rotation = 40 } }

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class AnimationDSLBuilder { }

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fun animation(init: AnimationDSLInit) = AnimationDSLBuilder().apply(init)

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animation { }

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animation { frame(0) { x = 10 y = 20 } }

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fun frame(frameNumber: Int, frameBlock: FrameInit) { val frame = Frame().apply(frameBlock) frames[frameNumber] = frame }

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animation { frame(0) { x = 10 y = 20 } 0.frame { x = 10 y = 20 } }

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fun Int.frame(frameBlock: FrameInit) { val frame = Frame().apply(frameBlock) frames[this] = frame }

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animation { frame(0) { x = 10 y = 20 } 0.frame { x = 10 y = 20 } 20 { rotation = 40 } }

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