main.kt

fun main() {
//    val a = "url"
//    val b = optional({ a.length > 2 } ){
//        println("a > 2")
//
//    }
//    b()
//    val iter = iterator(0, {
//        if(it < 10) it + 2 else null
//    }){
//        println(it)
//    }
//    iter()
//
//    val member = Member({"aa"} , 11)

    val list = listOf('a', 'b', 'c', 'X', 'Z')
    println(list.takeLast(3) eq "[c, X, Z]")
    println(list.takeLastWhile { it.isUpperCase() } eq "[X, Z]")
    println(list.drop(1) eq "[b, c, X, Z]")
    println(list.dropWhile { it.isLowerCase() } eq "[X, Z]")
    val member = "hika" age 10 grade 10

    val a1 = listOf(1,2,3,0).any{it > 0}
    val a11 = listOf(1,2,3,0).fold(AnyFold(false){it > 0}){acc, it->
        if(acc.result) acc else AnyFold(acc.lambda(it), acc.lambda)
    }.result
    val a2 = listOf(1,2,3,0).all{it > 0}
    val a3 = listOf(1,2,3,0).map{it * 2}
    val a33 = listOf(1,2,3,0).fold(listOf<Int>()){acc, it->
        acc + it * 2
    }
    val sum = listOf(1,2,3,0).fold(0){acc, i ->
        acc + i
    }
    listOf(1,2,3,0).forEach{println(it)}
    listOf(1,2,3,0).fold({it:Int->println(it)}){acc, it->
        acc(it)
        acc
    }
}
data class AnyFold(val result: Boolean, val lambda:(Int)-> Boolean)
data class Member(val name:String, val age:Int, val grade:Int = -1)
infix fun Member.grade(grade:Int):Member = Member(this.name, this.age, grade)
infix fun String.age(age:Int):Member = Member(this, age)
infix fun Any.eq(b:String): Boolean {
    return this.toString() == b
}
infix fun Boolean.eq(b:String): Boolean {
    return this.toString() == b
}



fun optional(condition:()->Boolean, lambda:()->Unit):()->Boolean
= {
    if(condition()) lambda()
    condition()
}

fun iterator(init:Int, condition:(Int)->Int?, lambda:(Int)->Unit):()->Unit
= {
    var accumulator = init
    do{
        accumulator = condition(accumulator) ?: break
        lambda(accumulator)
    }while (true)
}