learn typescript

designed to develop large-scale applications and ensure the compatibility of compiled JavaScript code. TypeScript extends the JavaScript syntax, so the existing JavaScript code can be directly run with TypeScript without changing The TypeScript file extension is ts, while the TypeScript compiler will compile and trans

Typescript is a free and open source programming language developed by Microsoft. It is a superset of JavaScript and essentially adds an optional static type and class-oriented object-oriented programming to the language, and its official website is http://www.typescriptlang.org/. Why to learn this language, now HTML5 strong momentum of development, as a developer at any time to focus on new things become t

JavaScript.enum Color { Red, Green, Blue}; var c:color = Color.green;Like C #, if the value of the first item is not declared, then the value of Red above is 0, then each item is incremented by one, that is, Green is 1,blue is 2.enum Color { = 1, Green, Blue}; var c:color = Color.green;So the value of Red at this time is 1,green to 2,blue of 3.Of course, you can also specify a value for each item.enum Color { = 1, = 2, = 4}; var c:color = Color.green;In addition, ther

applications and ensure the compatibility of compiled JavaScript code. Typescript extends the Javascript syntax, so the existing JavaScript code can be directly run with typescript without changing The typescript file extension is ts, while the typescript compiler will compile and translate the file into JS files.

Typescript is designed to develop large-scale applications and ensure the compatibility of compiled JavaScript code. Typescript extends the Javascript syntax, so the existing JavaScript code can be directly run with typescript without changing The typescript file extension is ts, while the

in JavaScript, it is possible to pass in as many parameters as you want. However, from the example above TypeScript, we can see that TypeScript will check the number of parameters and whether the type matches. Therefore, there is a need for overloading in TypeScript.varsuits = ["Hearts", "spades", "clubs", "Diamonds"];functionPickcard (x: {suit:string; card:number;} []): number;functionPickcard (X:number):

TypeScript extends the syntax of JavaScript so that existing JavaScript code can be run directly with TypeScript without changing The TypeScript file extension is TS, and the TypeScript compiler compiles it into a JS file TypeScript syntax is the same as JScript

It ' s common in Javascript for functions to accept different argument types and to also return different types. In this lesson we learn "teach ' Typescript about these dynamic functions so we can still benefit from the Powe rful static type analysis.Const GETTASKS = (taskname:string, x:any): any = { if(typeofx = = = ' function '){ return{taskname, fn:x}; } if(Array.isarray (x)) {return{tasknam

-scale applications and ensure the compatibility of compiled JavaScript code. TypeScript extends the JavaScript syntax, so the existing JavaScript code can be directly run with TypeScript without changing The TypeScript file extension is ts, while the TypeScript compiler will compile and translate the file into js fi

TypeScript entry-interface, typescript entry interfaceToo many rows too many rowsIntroduction In TypeScript, an interface is used to name these types and define contracts for your code or third-party code. ▓ Interface Example: function printLabel(labelledObj: { label: string }) { console.log(labelledObj.label); } let myObj = { size: 10, label: "Siz

TypeScript-enumeration, type inference, and typescript EnumerationEnumeration You can use enumeration to define some numeric constants with names. The enum keyword is used in the same way as in C. enum Direction { Up = 1, Down = 1 Note:: An Enumeration type can have multiple enumeration members. Each enumeration member has a corresponding numeric value, which can be a constant or a calculated value.

class Zipcodevalidator implements Stringvalidator { isacceptable (s:string) { return S.length = = = 5 numberregexp.test (S ); }}Test.ts///////////Some samples to tryvarstrings = [' Hello ', ' 98052 ', ' 101 '];//validators to usevarValidators: {[s:string]: validation.stringvalidator;} ={};validators[' ZIP code '] =Newvalidation.zipcodevalidator (); validators[' Letters only '] =Newvalidation.lettersonlyvalidator ();//Show Whether each string passed each validatorStrings.fo

Use Visual Studio Code to develop TypeScriptNote: Follow these steps to develop TypeScript on the Windows and OS X operating systems using Visual Studio Code.Preface To solve JavaScript: lack of object-oriented syntax, lack of errors during compilation, and so on. Microsoft provides an open-source TypeScript language that allows developers to write TypeScript pro

: TypeScript is a Microsoft-launched open source language that uses the Apache licensing agreement TypeScript adds static types, classes, modules, interfaces, and type annotations TypeScript can be used to develop large-scale applications TypeScript easy to lea