Learn TypeScript

Basic.ts

let title: string = 'Hello World';
// or let title = $('#user_name').val();

(title as string).split(' ');
(<string>title).split(' ');

// fix window issue
// Element implicitly has an 'any' type because type 'Window' has no index signature?
declare global {
    interface Window { MyNamespace: any; }
}

window.MyNamespace = window.MyNamespace || {};

// better than obove
interface Window: {
    [key:string]: any; // Add index signature
}

// optional parameter syntax

function functionName(a: number, b?: number) {
 
}

// optional parameter check
function getSchool(name: string, address?: string, pinCode?: string): string {
    if (address == undefined) {
        console.log('address not defined');
    }
    if (pinCode == undefined) {
        console.log('pincode not defined');
    }
    //...
}

installTypes.sh

 #!/bin/bash
 npm install  @types/angular @types/jquery @types/node @types/socket.io @types/socket.io @types/socket.io-client @types/googlemaps @types/express