Kotlin 中 infix 关键字的原理和使用场景解析

class Person(private val name: String) {
    // 成员中缀函数
    infix fun say(message: String) {
        println("$name says $message")
    }
}
// 扩展中缀函数
infix fun Int.multiply(factor: Int): Int = this * factor

public final class Person {
   private final String name;
   public final void say(@NotNull String message) {
      Intrinsics.checkNotNullParameter(message, "message");
      String var2 = this.name + " say " + message;
      System.out.println(var2);
   }
   public Person(@NotNull String name) {
      Intrinsics.checkNotNullParameter(name, "name");
      super();
      this.name = name;
   }
}

infix fun <T> T.shouldEqual(expected: T) {
    if (this != expected) throw AssertionError("Excepted $expected, but got $this")
}
// 使用
actualValue shouldEqual expectedValue

infix fun Int.pow(exponent: Int): Int = toDouble().pow(exponent).toInt()
val result = 2 pow 3 // 等价于 2.pow(3)

val map = mapOf(
    "name" to "Eileen",
    "age" to 30
)

infix fun String.concatWith(another: String) = "$this$another"
// 链式中缀调用
val message = "Hello" concatWith "World" concatWith "!"

1 + 2 and 3 // 等价于 (1 + 2) and 3

infix fun <A, B> A.to(that: B): Pair<A, B> = Pair(this, that)

val range = 1 until 10 // 等价于 1.until(10)

for (i in 10 downTo 1 step 2) {
}