set

Allows to use the index operator for storing values in a mutable map.

inline operator fun <K, V> MutableMap<K, V>.set(key: K, value: V)(source)

fun main() {
    val scores = mutableMapOf<String, Int>()

    // Add entries
    scores["Alice"] = 90
    scores["Bob"] = 85

    // Update an existing entry
    scores["Alice"] = 95

    println(scores)  // Output: {Alice=95, Bob=85}
}

Source