Typescript language Features

• JavaScript is the typescript code that is available. Exceptions: the WITH () function and the const keyword for firefox. Variable types cannot be changed dynamically
• Variables that do not use VAR in the variable JS are global variables TS inside this will be an error. TS Global variables need to declare var myvar = 0 at the highest level of the program;
• Type TS has optional type detection: main type, array, enum, type strong <type>variable,
• Interface TS interface can set properties
• Class TS Construction function name fixed to constructor
• Alternative notation for TS functions-arrow functions function Arrfuc () {}; Arrfun = () =>{}
• Module equivalent to JS inside the package
• Generic JS Generics

Typescript language Features