Array objects are mutable. You can use []= to replace an existing array element given its 0-based index, just as you can use [] to retrieve an element by index.

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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
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