Kotlin collections have a forEach() function that lets you iterate over the collection members, invoking a lambda expression for each.

For Array, List, and Set, the lambda expression takes a single parameter. The lambda expression for forEach() on a Map takes two parameters: the key and the associated value.

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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
Accessing Elements via [] Combining Collections for Loop forEach() forEach() is a Function Maps
filter() for Loop forEach() forEach() is a Function map() map() Type Conversions Sets
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