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Kotlin Collections
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| Q. What are some examples of collections ? | |
| A. Lists, Arrays, Maps, Sets are collections. | |
| Q. How many types of lists are there? | |
| A. Lists are of two types : Mutable Lists and Immutable Lists. | |
| Q. What is a map? | |
| A. A map is a collection that holds and key and a value pair. | |
| Q. What datatypes can be stored in collections? | |
| A. You can store any type of variables in the collections. |
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| Q. How to create a mutable list? | |
| a) var list : mutableListOf<Any> = mutableListOf(1,2,3,4) | |
| b) var list : MutableListOf<Any> = mutableListOf(1,2,3,4) | |
| c) var list : MutableListOf<Any> = MutableListOf(1,2,3,4) | |
| A. b) var list : MutableListOf<Any> = mutableListOf(1,2,3,4) | |
| Q. How to delete an element e from a list numList? | |
| a) numList.clear(e) | |
| b) numList.removeAt(e) | |
| c) numList.remove(e) | |
| A. c) numList.remove(e) | |
| Q. How to add a key value pair (key, val) in a map? | |
| a) map.put(key to val) | |
| b) map.put(key, val) | |
| c) map.put(val, key) | |
| d) map.put(val to key) | |
| A. b) map.put(key, val) | |
| Q. What are x and y if we traverse a map? | |
| for((x, y) in map){ | |
| } | |
| a) x is key, y is val | |
| b) x is val, y is key | |
| A. a) x is key, y is val |
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