Problem Statement
What does the map function do on collections?
Explanation
The map function applies a transformation to each element in a collection and returns a new collection with the transformed elements, like listOf open paren 1 comma 2 comma 3 close paren dot map open curly it times 2 close curly returning listOf open paren 2 comma 4 comma 6 close paren. It's one of the most commonly used functional operations for transforming data.
Map is a pure function that doesn't modify the original collection but creates a new one, promoting immutability and functional programming style. You can chain map with other operations for powerful data transformations.
Related functions include mapNotNull to filter out nulls, mapIndexed to access element indices, and flatMap to transform and flatten nested collections in one operation.
Practice Sets
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