map

Full name: taxi.stdlib.map

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Signature

declare extension function <T,A> map(collection: T[], callback: (T) -> A):A[]

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Description

Applies a transformation function to every element in a collection, returning a new array of the results.

If the callback is a type expression, each element is converted to that type:

// Convert Person[] to Name[]
Person[].map((Person) -> Name)

If the callback is any other expression, it is evaluated against each element:

// Return an array of uppercased titles
Film[].map((Title) -> Title.upperCase())

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Examples

Extracts a field from each object in a collection, returning a typed array.