Most efficient way to remove duplicates in an array of CDT or Map based on a specific key?

I need to check a specific field in an array of cdt or map for duplicates, and return an array of cdt or map without duplicates on that field. For example:

CDT Array:

{
type!example(

email: "hello@gmail.com",

type: 1,

date: 01/01/2022

),

type!example(

email: "hello11@gmail.com",

type: 1,

date: 03/02/2023

),

type!example(

email: "hello@gmail.com",

type: 2,

date: 01/02/2023

)

}

In the above case, I want to return an array with unique email fields. Since the first and third item in the array have the same email address "hello@gmail.com", I only want to return the first one.

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