Kotlin basics : Using Map in the code - devrath/KotlinAlchemy GitHub Wiki

About Map

• A Map is a part of a collection framework where you provide a key as an input and you get a corresponding value as an output.
• Map is also called a dictionary.

When to use Map and when to use MutableMap

• Map - > This is used when we have a fixed set of elements and it won't modify at runtime.
• MutableMap -> We use this when the collection has to be modified at runtime
• If you try to fetch a value for a key where the key does not exist, we get a null reply

 private fun initiate() {
        val listOfCities = mapOf(
            1 to "Bangalore",
            2 to "Mumbai",
            3 to "Chennai",
        )
        println(listOfCities[1])
        val listOfNames = mutableMapOf(
            1 to "Manish",
            2 to "John",
            3 to "Sam",
        )
        listOfNames[4] = "Anudeep"
        println(listOfNames[4])
    }
}