Many Kotlin collections have a filter() function. It takes a lambda expression that accepts a single element from the collection as a parameter. filter() then returns the subset of items in the collection for which that lambda expression returns true. As the name suggests, you can use this for filtering a larger collection to find a relevant subset.

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Accessing Elements via [] Array Modification Arrays filter() for Loop forEach() forEach() is a Function map() map() Type Conversions Typed Arrays
Accessing Elements via [] any() any() and Short Circuits Array Modification Arrays Combining Collections filter() first() first() Sans Lambda firstOrNull() firstOrNull() and the Elvis Operator fold() for Loop forEach() forEach() is a Function joinToString() Lists map() map() Type Conversions Maps Mutable Lists Sets Typed Arrays
Accessing Elements via [] Combining Collections filter() for Loop forEach() forEach() is a Function Lists map() map() Type Conversions Mutable Lists
filter() for Loop forEach() forEach() is a Function map() map() Type Conversions Sets
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