jgentes/Generic Custom Types.md

## Generic Custom Types.md

      
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              Generic Custom Types.md
            
          
    // Type User can have an ID which is either a number or a string
type User<CustomType extends (number | string)> = {
id: CustomType,
name?: string,
age?: number
}
// In this case, we define CustomType as a string
let myUser:User = {
id: "1234-1234-1234",
name: "John Doe",
age: 24
}
// In this case, we define CustomType as a number
let myOtherUser:User = {
id: 1234,
name: "Jane Seymore",
age: 48
}