Let us start TypeScript programming with simple “Hello World!” example.
Create and save the file with .ts extension. In first line we declare a variable of string type. In second line we display the variable’s value at the terminal window.
TypeScript Hello World:
var message:string = "Hello World!" ; console.log(message);
As we discussed in earlier tutorials that TypeScript code will be converted into JavaScript Code. After the compilation of above TypeScript code following JavaScript code will be generated.
Translated code:
var message = "Hello World!"; console.log(message);
Compile and Execute a TypeScript Program:
Comiple: Use below command on the terminal window for compilation. tsc typeScriptFileName.ts Note − Multiple files can be compiled at once. tsc typeScriptFileName1.ts, typeScriptFileName2.ts, typeScriptFileName3.ts
Execute: Use below command on the terminal window for execution. node typeScriptFileName.js
