Use Multiple Datatype in Single Variable on Typescript - Union Type

Typescript have concept Union Type to allow assign multiple datatypes/types for single variable. 

Syntax :

let myVar: string | number

Use Pipe '|' symbol between two types. Here the variable myVar accepting both string and numbers. Union type is useful for to avoid/reduce the use of any type in our code.

I hope this useful for you. Happy Coding.