Zhentiw - 博客园

2020年10月11日

摘要： fun main() { val mode = 3 when (mode) { 1 -> print("1 is ok") 2 -> { print("2 is fine") print("2 is fine") } else -> { print("large than 2 is not ok") 阅读全文

posted @ 2020-10-11 02:07 Zhentiw 阅读(64) 评论(0) 推荐(0)

[Kotlin] Nullable Variables

摘要： In Kotlin, it helps to avoid null reference, which means by default you cannot assign null value to any variable; But if you do want to assign null to 阅读全文

posted @ 2020-10-11 01:56 Zhentiw 阅读(115) 评论(0) 推荐(0)

[Kotlin] Primitive Types and String

摘要： fun main() { val a = 4 val b: Byte = 127 val c: Short = 123 val d: Int = 7 val e: Long = 123456789 val f: Float = 3.73f val g: Double = 3.73 val h: Ch 阅读全文

posted @ 2020-10-11 01:48 Zhentiw 阅读(79) 评论(0) 推荐(0)

[Kotlin] val for const variable

摘要： using 'var', variable can be reassigned. using 'val', variable cannot be ressiagned. the same as Javascript 'const'. 阅读全文

posted @ 2020-10-11 01:32 Zhentiw 阅读(87) 评论(0) 推荐(0)

2020年10月9日

[Typescript] Emitting Declaration Files

摘要： Sometime when you create a library, you want types create automatcially for you, instead of typing all the types information by yourself. // tsconfig. 阅读全文

posted @ 2020-10-09 01:24 Zhentiw 阅读(160) 评论(0) 推荐(0)

[Typescript] Augmenting Modules with Declarations

摘要： In lodash, you can use 'mixin' to create a new function on lodash object. import * as _ from 'lodash'; _.chunk([1, 2, 3, 4], 2); // [[1,2], [3,4]] _.m 阅读全文

posted @ 2020-10-09 01:19 Zhentiw 阅读(94) 评论(0) 推荐(0)

2020年10月8日

[Postgres] On conflict Do Something Clause in Postgres

摘要： Instead of first checking to see if a record already exists within your table, we can do a on conflict do update. In this command, we can ether insert 阅读全文

posted @ 2020-10-08 02:25 Zhentiw 阅读(190) 评论(0) 推荐(0)

[React] Debug Custom React Hooks With useDebugValue

摘要： The useDebugValue hook will not effect your user experience but is instead aimed at improving the developer experience. When building your own custom 阅读全文

posted @ 2020-10-08 02:19 Zhentiw 阅读(138) 评论(0) 推荐(0)

2020年10月6日

[Typescript] Function Overloads

摘要： function reverse(str: string): string; function reverse<T>(arr: T[]): T[]; function reverse<T>(stringOrArray: string | T[]): string | T[] { if (typeof 阅读全文

posted @ 2020-10-06 18:20 Zhentiw 阅读(158) 评论(0) 推荐(0)

[Typescript] Function Generics

摘要： class Pizza { constructor(private name: string, private price: number) {} } class List<T> { private list: T[]; addItem(item: T): void { this.list.push 阅读全文

posted @ 2020-10-06 18:14 Zhentiw 阅读(84) 评论(0) 推荐(0)

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