Problem Statement
What does the filter function return?
Explanation
The filter function returns a new collection containing only the elements that satisfy the given predicate condition, like numbers dot filter open curly it greater 5 close curly returns elements greater than 5. It doesn't modify the original collection but creates a new filtered version.
Filter is essential for functional-style data processing, often combined with map and other operations to build complex data transformation pipelines. Related functions include filterNot for inverse filtering and filterNotNull to remove null elements.
You can use filterIsInstance to filter by type with automatic casting, filterIndexed to access indices in the predicate, and partition to split a collection into two lists based on a condition.
Practice Sets
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