Typescript. What’s for?
Example №1
in js we can do tricks like this
const message = «hi»; message.toUpperCase(); // keeping in mind that it is a string /*
Js. –save vs –save-dev
Пантелеев Станислав—save-dev is used to save the package for development purpose. Example: unit tests, minification..—save is used to save the package required for the application to run
Js. Bind vs Call vs Apply
Пантелеев СтаниславBind vs Call vs Appl from stack overflow
Call invokes the function and allows you to pass in arguments one by one.Apply invokes the function and allows
Typescript. d.ts files
Пантелеев Станиславneeded to use js code in ts code through declarations
looks like this stackoverflow post describes it the best
as i understood js files and
Typescript. Modules
Пантелеев СтаниславModules also created to group out code. Lets look at example
hi.ts // this will be the module
export default function sayHi() { console.log(‘hi, there’);
Typescript. Namespaces
Пантелеев Станиславnamespaces allow logically group our code
namespace Animals { interface Animal { sayHi(): void } class Dog implements Animal { sayHi(): void { console.log(‘av-av’); }
Typescript. Generics
Пантелеев Станиславfunction foo<T>(x: T): T { // calc return x; } console.log(foo<string>(‘hi, there’)); console.log(foo<number>(123)); // — extends for generics function foo2<T extends { name: string
Typescript. Type Assertions
Пантелеев Станиславas it was mentioned in DataTypes post there are 2 ways of assertions through as and <type> operators
// Type assertions const myCanvas =
Typescript. Static methods and fields
Пантелеев СтаниславHere is the same idea as in C#, Java and other langs. Static methods are methods that more devoted to class rather than to instance
Typescript. get / set modifiers
Пантелеев Станиславworks only with ecmaScript2015
class Man { private _name: string = «DefaultName»; get name(): string { return this._name } set name(value: string) { console.log(‘been here’);