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Arrays
Tuple
Enum
Unknown
Any
Void
Union of Types

#TypeScriptTutorials
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Arrays
to work with array of values
let list1: number[] = [1,2,3]
let list2: Array＜number＞ = [1,2,3]

Tuple
for fixed values but different types
let x: [string, number]; // declare
x = ["hello", 10]; // initialize
x = [10, "hello"]; // error
console.log(x[0].substring(1)); // accessing

Enum
giving more friendly names to sets of values
enum Color {Red=3, Green, Blue,}
let c: Color = Color.Green;
console.log (c)
By default, enums begin numbering their members starting at 0
You can change this by manually setting the value of one of its members

Unknown
when describing a variable without knowing the type of values it may have to store
let notSure: unknown = 4;
notSure()
notSure.toUpperCase()
(notSure as string).toUpperCase()

Any
when not knowing the type of the value,
can opt out of type checking using any
let anyValue: any = 10;
anyValue = true
anyValue = ‘hello’
anyValue()
anyValue.toUpperCase()

Void
absence of any type
commonly used as return type of functions that do not return any value

function warnUser(): void {
console.log("This is my warning message");
}

Union of Types
Multiple types for same variable
let peopleAllowed: number | boolean
peopleAllowed = 10
peopleAllowed = false

Can use when the type of value is unknown or not under your control
Coming from external source or user
Intellisense support

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