Zhentiw - 博客园

2020年10月28日

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

posted @ 2020-10-28 20:58 Zhentiw 阅读(139) 评论(0) 推荐(0)

[Kotlin] The Let function

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

posted @ 2020-10-28 20:54 Zhentiw 阅读(80) 评论(0) 推荐(0)

[Kotlin] The Elvis operator

摘要： In Javascript, we have: return age null ? -1 : age In kotlin, we can do the same thing with a better / simpler syntax: val safeAge: Int get() = age ?: 阅读全文

posted @ 2020-10-28 20:37 Zhentiw 阅读(139) 评论(0) 推荐(0)

2020年10月27日

[Kotlin] Destructuring and ComponentN functions

摘要： For data class, you can get 'copy' method, and also destructing: data class Customer (val name: String, val address: String, var age: Int) { // if we 阅读全文

posted @ 2020-10-27 17:04 Zhentiw 阅读(108) 评论(0) 推荐(0)

[Kotlin] implicit getterr && setter (field keyword)

摘要： // Shorter version class AnotherAlternativeCustomer (val name: String,var age: Int, val address: String = "") { var approvered: Boolean = false set(va 阅读全文

posted @ 2020-10-27 16:49 Zhentiw 阅读(135) 评论(0) 推荐(0)

[Kotlin] Multi ways to write constuctor in Kotlin

摘要： package com.rsk class Customer (val name: String, val address: String, var age: Int) { // if we don't want to pass in the address constructor(name: St 阅读全文

posted @ 2020-10-27 16:42 Zhentiw 阅读(152) 评论(0) 推荐(0)

2020年10月26日

[CSS] Use CSS Transforms to Create Configurable 3D Cuboids

摘要： In this lesson, we use CSS transforms to create configurable 3D cuboids. Using CSS transforms in combination with scoped CSS variables, we are able to 阅读全文

posted @ 2020-10-26 21:37 Zhentiw 阅读(198) 评论(0) 推荐(0)

[CSS] Use CSS Variables Almost like Boolean Values with Calc (maintainable css)

摘要： In this lesson, we explore how you can use CSS variables almost like Boolean values in combination with calc(). By setting a variable to 1 or 0 and th 阅读全文

posted @ 2020-10-26 21:29 Zhentiw 阅读(154) 评论(0) 推荐(0)

[Kotlin] Typecheck with 'is' keyword, 'as' keyword for assert type

摘要： val randomNumber = Random().nextInt(3) if (randomNumber is BigDecimal) { result = result.add(BigDecimal(36)) } If you use type check, then 'result' is 阅读全文

posted @ 2020-10-26 18:36 Zhentiw 阅读(86) 评论(0) 推荐(0)

[Kotlin] When to add () and when not to

摘要： Let's see following code: println(colors.reduce { acc, curr -> "$acc, $curr" }) // red, blue, green, black val myMap = mapOf(1 to "one", 2 to "two", 3 阅读全文

posted @ 2020-10-26 16:22 Zhentiw 阅读(136) 评论(0) 推荐(0)

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