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After version 3.5, TypeScript added an omit < T, k > type. Omit < T, k > types can exclude some attributes from inherited object attributes. type User = { id: string; name: string; email: string; }; type UserWithoutEmail = Omit<User, "email">; // Equivalent to type UserWithoutEmail = { id: string; name: string; }; ...

object-oriented That is, the operations in the program need to be completed through objects, for example: To operate the browser, use the window objectThe document object is used to manipulate the web pageTo operate the console, use the console object In the program, all objects are divided into two parts: data and function. There is no more ...

The first installment introduces the configuration of development tools introduce TypeScript introduction 1 TypeScript is an open source programming language developed by Microsoft. 2. TypeScript is a superset of JavaScript and follows the latest ES6 and Es5 specifications. TypeScript extends the syntax of JavaScript. 3. TypeScript is mor ...

ts data type ts data basic data type After declaring the type, the type of the variable cannot be changed A vertical bar |: indicates or is used to connect multiple types (Union types) question mark? Representative optional &Represent and boolean type let bool:boolean=true Number type number let num:number=10 String type string ...

Type inference: If no type is explicitly specified, TS will infer a type according to the rule of Type Inference: let myFavoriteNumber = 'seven'; //No mistake myFavoriteNumber = 7; //Type 'number' is not assignable to type 'string'. Note: different from declaring no assignment, declaring no assignment will be set to any ...

preface For students with JavaScript foundation, it is actually easy to get started with TypeScript. You can gradually transition from JS application to TS application by simply mastering its basic type system. // js const double = (num) => 2 * num // ts const double = (num: number): number => 2 * num However, when the application b ...

🖼️ preface Recently, I used vue3 and ts to play with some gadgets. I found that a common requirement in normal development is the rendering of data list. Now I study again and find that many design specifications and logic I considered when learning vue2 are not particularly appropriate. Therefore, write this article to record the desig ...

  Decorator is a special type of declaration that can be attached to class declarations, methods, accessors, properties or parameters to modify the behavior of a class. The decorator uses @ expression. Expression must be a function after evaluation. It will be called at run time, and the decorated declaration information will be passed in as ...

Basic type of TS Boolean type let isDo:boolean = true; === var isDo = true Number type let num:number = 5; === var num = 5 String type let name:string = 'mery'; === var name = 'mery' Array type let arr:number[] = [1,2,3]; === var arr =[1,2,3] let arr:Array<number> = [4,5,6]; //Array < number > is a gen ...

1, Regular expression overview Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. 2, How to create regular expressions Call the constructor of the RegExp object to create it const regexp=new RegExp(/123/); //123 is the regular expression content Creat ...