L04_JS_TS

L04.1_Intro

• created and linked hello world in js
• in typescript: need json file: tsc --init / shift strg b

Einblick

• v=v+1: adds 1 to v and saves value in v
• =: first right side, saves in left side

Variablen

• variables are... variable
• variable needs to be declared first -> let v=1
• definition of a variable -> for example v=v+1

Datentypen

• explicit annotation of datatypes: let/const name: type = value;

Primitive Datentypen

• in ts/js: number, string, boolean

• ts pro: improved error checking, IDE support for code hinting and completion, and compatibility with newer ECMAScript features
• ts con: steeper learning curve, additional compilation steps, potential overreliance on its compiler for error detection
• source

Arithmetic operators

• Addition (+)
• Subtraction (-)
• Multiplication (*)
• Exponentation (**)
• Division (/)
• Modulus/Division Remainder (%)
• Increment (++)
• Decrement (--)

Assignment operators

• =
• += (the same as x=x+y)
• -=
• *=
• /=
• %=
• **=

Comparision operators

• Equal to (==)
• equal value and equal type (===)
• not equal (!=)
• not equal value or not equal type (!==)
• greater than (>)
• less than (<)
• greater than or equal to (>=)
• less than or equal to (<=)
• ternary operator (?) -> let voteable = (age < 18) ? "Too young":"Old enough";

Logical operators

• logical and (&&)
• logical or (||)
• logical not (!)

Type operators

• returns type of a variable (typeof)
• returns true if an object is an instance of an object type (instanceof)

Bitwise operators

• AND (&)
• OR (|)
• NOT (~)
• XOR (^)
• left shift (<<)
• right shift (>>)
• unsigned right shift (>>>)

Arrays

Objects