Zhentiw - 博客园

2020年10月15日

[Kotlin] companion object == static method

摘要： In Kotlin, there is no static methods, but we can use companion object which works the same as static methods. For example, a class: package com.rsk i 阅读全文

posted @ 2020-10-15 18:30 Zhentiw 阅读(149) 评论(0) 推荐(0)

[Kotlin] Shorthand syntax for FP

摘要： First version: fun main(args: Array<String>) { val providers = Providers() val details = providers.getAllProviders() details.forEach { detail -> print 阅读全文

posted @ 2020-10-15 00:08 Zhentiw 阅读(120) 评论(0) 推荐(0)

2020年10月14日

[Kotlin] Using High Order Function

摘要： fun getAllProviders(fn: (String, String) -> Unit) { // Unit is just like void val allProviders = Providers.getProviders() val it = allProviders.iterat 阅读全文

posted @ 2020-10-14 16:05 Zhentiw 阅读(71) 评论(0) 推荐(0)

[Kotlin] Exercise for Map

摘要： fun main(args: Array<String>) { val ipToCount = mutableMapOf<String, Int>() File("src/ips.txt").forEachLine { val previous = ipToCount.getOrDefault(it 阅读全文

posted @ 2020-10-14 15:26 Zhentiw 阅读(124) 评论(0) 推荐(0)

[Kotlin] Working with Map

摘要： fun main(args: Array<String>) { val namesToAges = mapOf(Pair("Peter", 24), Pair("Roger", 42)) val namesToAges2 = mapOf( "Peter" to 24, "Roger" to 42 ) 阅读全文

posted @ 2020-10-14 15:20 Zhentiw 阅读(94) 评论(0) 推荐(0)

[Kotlin] File I/O

摘要： import java.io.File fun main(args: Array<String>) { File("src/inputFile.txt").forEachLine { print(it) // it refers to each line's content } } 阅读全文

posted @ 2020-10-14 15:06 Zhentiw 阅读(176) 评论(0) 推荐(0)

[Kotlin] Remove duplicate item from Array with toHashSet

摘要： var letters = str.toLowerCase().toCharArray().toHashSet() 阅读全文

posted @ 2020-10-14 15:04 Zhentiw 阅读(87) 评论(0) 推荐(0)

[RxJS] onErrorResumeNext

摘要： onErrorResumeNext Will subscribe to each observable source it is provided, in order. If the source it's subscribed to emits an error or completes, it 阅读全文

posted @ 2020-10-14 03:17 Zhentiw 阅读(160) 评论(0) 推荐(0)

[RxJS] throwIfEmpty

摘要： import { fromEvent, timer } from 'rxjs'; import { throwIfEmpty, takeUntil } from 'rxjs/operators'; const click$ = fromEvent(document, 'click'); click$ 阅读全文

posted @ 2020-10-14 03:05 Zhentiw 阅读(124) 评论(0) 推荐(0)

[Kotlin] I/O readline

摘要： import java.util.* fun main(args: Array<String>) { val number = Random().nextInt(100) + 1 var input: String? var guess = -1 while(guess!=number) { pri 阅读全文

posted @ 2020-10-14 02:54 Zhentiw 阅读(120) 评论(0) 推荐(0)

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