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The Android Playground

16 Nov, 17:23

Which function is used to check a spesific value's existence in the elements of a list or an array?

Poll

any()
filter()
map()
shuffle()

4 votes

32 0 0

- What is the difference between:

reverse()
reversed()
reversedArray()

· Well when we think about like what was the purpose of this thing , to create same methods which will do the same this thi really makes a sense but these functions in kotlin not will do same thing actually each of those have their own specific job

reverse() - this method turns array/collections element into reverse like this:
[1,2,3,4,5] -> [5,4,3,2,1] but you cannot absorb it to another value like this:

var c = myArray.reverse() // c is now Unit not array which gives us nothing

And that's why we got a reversed() and reversedArray() methods which will helps us to get a reversed value from a List or Array and it will not effects for the original array like this:

var myArray: Array = arrayOf(1, 2, 3, 4, 5) // org array
var c = myArray.reversed() // List = [5,4,3,2,1]
var d = myArray.reversedArray() // Array = [5,4,3,2,1]

And those methods doesn't effects for the original array

59 0 0

The Android Playground

14 Nov, 10:13

🤔 But How it actually works ?

1) First of all let's look at the code that was given to us:

var myArray:Array = arrayOf(1,2,3,4,null)

In this code when you give your attention to the " ? " it means that the elements of this Type of variable can be null like this

var myNumber:Int? = null // works
var myNumber2:Int = null // this will give us error

With that thing we're telling to our type that that: my element can be null at somewhere and you have to work even though it has a null value and it works properly without any problems and exceptions

2) And now when if we do like this in our code

var a = myArray.map { it * 2 }

This code won't work because of myArray can have a null value which we talked at first.

And that's why it can't multiply ( a null for * 2) and for fixing that problem we use if the elements has no any null value like this

filterNotNull()

This method tells that : when it has a null value then give me each one of their multiplication but except null elements and it works .

86 0 0

The Android Playground

14 Nov, 09:48

var a : Array = arrayOf ( 1 , 2 , 3 , 4 , null ) var b = a.map { it * 2 }

Poll

[ 1 , 2 , 3 , 4 , null ]
[ 2 , 4 , 6 , 8 , null ]
There will be error in the code
[ null ]

2 votes

85 0 0

The Android Playground

14 Sep, 13:51

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The Android Playground

14 Sep, 13:50

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The Android Playground

13 Sep, 13:41

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The Android Playground

13 Sep, 13:39

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The Android Playground

13 Sep, 13:38

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The Android Playground

13 Sep, 13:36

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The Android Playground

13 Sep, 13:34

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The Android Playground

13 Sep, 13:33

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The Android Playground

13 Sep, 13:31

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The Android Playground

13 Sep, 13:29

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The Android Playground

12 Sep, 18:07

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The Android Playground

12 Sep, 18:05

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The Android Playground

12 Sep, 18:03

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The Android Playground

12 Sep, 18:02

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