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Types of Variables:
Number
String
Boolean
Null
Undefined
Arrays


Number
let x: number = 10


String
let name: string = ‘TypeScript’


Boolean
let learningTypeScript: boolean = true


Static type checking, prevent from making mistakes
Accurate Intellisense


Undefined
A variable that has been declared but not yet assigned value
let u: undefined = undefined


Null
Null is assignment value. Can be assigned as representation of no value
let n: null = null


Null and undefined are sub types i.e. null and undefined can be assigned to boolean, number and string variables


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