我们已经创建了QueueClass的对象,并使用QueueClass的不同方法对Queue进行各种操作。 interfacequeueInterface<Type>{enQueue(dataItem:Type):void;deQueue():Type|undefined;isEmpty():boolean;isFull():boolean;size():number;printQueue():void;}classQueueClass<Type>implementsqueueInterface<Type>{privateQueueData:Arr...
interface CreateArrayFunc<T> { (length: number, value: T): Array<T>; } let createArray: CreateArrayFunc<any>; createArray = function<T>(length: number, value: T): Array<T> { let result: T[] = []; for (let i = 0; i < length; i++) { result[i] = value; } return resu...
* * @param {Array} middleware * @return {Function} * @api public */ function compose (middleware) { if (!Array.isArray(middleware)) throw new TypeError('Middleware stack must be an array!') for (const fn of middleware) { if (typeof fn !== 'function') throw new TypeError('Middlewa...
interface ReactNodeArray extends Array<ReactNode>{} type ReactFragment= {} |ReactNodeArray; type ReactNode= ReactChild | ReactFragment | ReactPortal |boolean|null| undefined; 可以看到,ReactNode是一个联合类型,它可以是string、number、ReactElement、null、boolean、ReactNodeArray。由此可知。ReactElement类...
2.5 Array 类型 2.6 Enum 类型 使用枚举我们可以定义一些带名字的常量。 使用枚举可以清晰地表达意图或创建一组有区别的用例。 TypeScript 支持数字的和基于字符串的枚举。 1.数字枚举 默认情况下,NORTH 的初始值为 0,其余的成员会从 1 开始自动增长。换句话说,Direction.SOUTH 的值为 1,Direction.EAST 的值为...
(event.target as any).result; // Create an objectStore to store our notes in (basically like a single table) // including a auto-incrementing key const objectStore = db.createObjectStore(Chapter1Component.DB_Table_Name, { keyPath: "_id" }); objectStore.transaction.oncomplete = (event) =...
import { Serializer } from 'example-library';/*** An interface describing a widget.* @public*/export interface IWidget {/*** Draws the widget on the display surface.* @param x - the X position of the widget* @param y - the Y position of the widget*/public draw(x: number, y: ...
Array(5).slice(); This is slightly different. Array(5) produces an array with a length of 5, but with no defined property slots! Copy 1 in [undefined, undefined, undefined] // true 1 in Array(3) // false And when TypeScript calls slice(), it also creates an array with indices ...
TypeScript Version: 3.0.3 Search Terms: Type based on values in array Is there a current or planned feature to create a type from strings in an array? Code const values = ['A', 'B'] type Foo = OneOf<values> // Is there a way of doing thi...
let deck = { suits: ["hearts", "spades", "clubs", "diamonds"], cards: Array(52), createCardPicker: function() { // NOTE: the line below is now an arrow function, allowing us to capture 'this' right here return () => { let pickedCard = Math.floor(Math.random() * 52); ...