Zhentiw - 博客园

2022年8月3日

[Typescript] Definite assignment operator

摘要： The definite assignment !: operator is used to suppress TypeScript’s objections about a class field being used, when it can’t be proven1 that it was i 阅读全文

posted @ 2022-08-03 20:11 Zhentiw 阅读(18) 评论(0) 推荐(0) 编辑

[Functional Programming] Write a strBuilder function to take unary params

摘要： Requirements: function strBuilder(str) { return strBuilder; // TODO } var hello = strBuilder("Hello, "); var kyle = hello("Kyle"); var susan = hello(" 阅读全文

posted @ 2022-08-03 19:56 Zhentiw 阅读(22) 评论(0) 推荐(0) 编辑

[Typescript] Type Guard: is & assert

摘要： value is Foo The first kind of user-defined type guard we will review is an is type guard. It is perfectly suited for our example above because it’s m 阅读全文

posted @ 2022-08-03 13:23 Zhentiw 阅读(46) 评论(0) 推荐(0) 编辑

[Typescript] Exhaustive conditionals - UnreachableError helper class

摘要： class UnreachableError extends Error { constructor(_nvr: never, message: string) { super(message) } } class Car { drive() { console.log("vroom") } } c 阅读全文

posted @ 2022-08-03 01:59 Zhentiw 阅读(11) 评论(0) 推荐(0) 编辑

2022年8月1日

[Typescript] Class - Param properties

摘要： For the following class: class Car { make: string model: string year: number constructor(make: string, model: string, year: number) { this.make = make 阅读全文

posted @ 2022-08-01 17:17 Zhentiw 阅读(35) 评论(0) 推荐(0) 编辑

2022年7月31日

[Functional Programming] Make a flip and reverse functions

摘要： function f(...args) { return args; } function flip(fn) { return function flipped (arg1, arg2, ...args) { return fn(arg2, arg1, ...args) } } let z = fl 阅读全文

posted @ 2022-07-31 16:45 Zhentiw 阅读(19) 评论(0) 推荐(0) 编辑

2022年7月28日

[Typescript] Construct Signatures

摘要： Construct signatures are similar to call signatures, except they describe what should happen with the new keyword. interface DateConstructor { new (va 阅读全文

posted @ 2022-07-28 15:46 Zhentiw 阅读(82) 评论(0) 推荐(0) 编辑

2022年7月27日

[Typescript] Recursion Type

摘要： Recursive types, are self-referential, and are often used to describe infinitely nestable types. For example, consider infinitely nestable arrays of n 阅读全文

posted @ 2022-07-27 19:15 Zhentiw 阅读(28) 评论(0) 推荐(0) 编辑

[TypeScript] Interface

摘要： An interface is a way of defining an object type. An “object type” can be thought of as, “an instance of a class could conceivably look like this”. Fo 阅读全文

posted @ 2022-07-27 19:14 Zhentiw 阅读(26) 评论(0) 推荐(0) 编辑

2022年7月26日

[Typescript] Tuple type usage example & Discriminated Unions

摘要： function flipCoin(): "heads" | "tails" { if (Math.random() > 0.5) return "heads" return "tails" } function maybeGetUserInfo(): | ["error", Error] | [" 阅读全文

posted @ 2022-07-26 14:50 Zhentiw 阅读(37) 评论(0) 推荐(0) 编辑

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