Question #1

=> 2.25 4.50 1.25 5=27 find Operations

start 2.25 + 4.50 = 6.75 then 6.75 / 1.25 = 5.4 then 5.4 * 5 = 27

Result => (2.25 + 4.50) / 1.25 * 5 = 27

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Question #2 Find Anagram with high order functions

    isAnagram("debit card","bad credit",{str1:String,str2:String -> 
              val hmap1 = HashMap<Char, Int?>()
              val hmap2 = HashMap<Char, Int?>()
              val arr1 = str1.toCharArray()
              val arr2 = str2.toCharArray()

              for (i in arr1.indices) {
                  if (hmap1[arr1[i]] == null) {
                     hmap1[arr1.get(i)] = 1
                  } else {
                    var c: Int = hmap1[arr1[i]] as Int
                    hmap1[arr1[i]] = ++c
                  }
              }

             for (j in arr2.indices) {
                 if (hmap2[arr2[j]] == null){
                    hmap2[arr2.get(j)] = 1
                 }else {
                   var d: Int = hmap2[arr2[j]] as Int
                   hmap2[arr2.get(j)] = ++d
                 }
             }
    
             hmap1 == hmap2
             })

   fun isAnagram(str1: String, str2: String, hasAnagram: (String,String) -> Boolean){ 
        print(hasAnagram(str1,str2))
   }

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Question #3 get two methods for generate nth Febonacci numbers

First Approach

fun getFebonacciNums(firstN : Int) : ArrayList<Int>{
    var list = ArrayList<Int>()
    for(i in 0..firstN){
       if(i == 0 || i == 1){
           list.add(i)
       }else{
           var num = list[i -2] + list[i -1]
           list.add(num)
       }
    }
    return list
}

Second Approach

fun fib(n :Int) : Int{
    if(n <= 1)
      return n
    return fib(n -1) + fib(n-2)
}

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Question #4

• Currency Converter App is way to get currency cost at time
• third party libraries i have used are
  • Retrofit & Okhttp => to call api with remote server in background thread and caching response in offline mode.
  • RxJava & LiveData => to observe on data and its changement also manage app life states.
  • MVVM => architect our app using viewModel to make code readable , testable and maintainable.
  • Navigation => to manage screens navigation and switching between Fragments.
  • Koin => dependency injection to easily get object from most used objects and manage data for memory and garbage Collection.
  • Esspresso => for UI testing
• when we want to add new feature.
  • create new branch with a copy of current code let's say (develop).
  • decide the input and output and also pattern for feature.
  • add dependencies if found.
  • if we are a team every one must have a branch from develop and after finish his task successfully (reviewed - tested - ...) merge this code to develop branch and so on.
  • After finish this feature and finially we can depend our app on it we can merge into the full app development before ready to store
  • I prefer to put branches for (store - development)
  • I prefer also using CI and CD for management of APK versions, updates and testing.

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