Answer1215

摘要： In Kotlin, you are able to extend a class. Just like add prototype in Javascript. fun toSentenceCase(a: String): String { return a[0].toUpperCase() + 阅读全文

摘要： import org.junit.jupiter.api.Assertions import org.junit.jupiter.api.Test import java.util.* class AgeCalculation() { fun getAge(dob: Calendar): Int { 阅读全文

摘要： In Java, when you write code in try(...), if exception throw, the resource will be closed automactially: This is not necessary in Kotlin fun printFile 阅读全文

摘要： In java, it requires you to handle the exception when you declaring and using the code: public class BoringJavaCode { public static Double divide(int 阅读全文

摘要： List is not mutable, when you want to add data into list, you can do is: "adding data to a mutableList", then return a immutable list by calling toLis 阅读全文

摘要： The part pseudo class allows consumers of a web component to manipulate certain key elements inside the Shadow DOM. In this lesson we will explore two 阅读全文

摘要： document.getElementById("app").innerHTML = ` <h1>Hello Parcel!</h1> <div> <button id="plus">+</button> <button id="mius">-</button> </div> `; const ad 阅读全文

摘要： (0..9).forEach(::println) (9 downTo 0).forEach(::println) (0 until 9).forEach(::println) // 0 to 8 (0..9 step 2).forEach(::println) ('A'..'F').forEach 阅读全文

摘要： fun getColorType() : String { val color = getUpperFavoriteColor() return when (color) { "" -> "empty" "RED", "GREEN", "BLUE" -> "rgb" else -> "other" 阅读全文

摘要： Let function is another way to solve null problem in kotlin. When you have such problem: var favoriteColor: String? = null...... return if f(avoriteCo 阅读全文