Solution to Salone Hackathon 2019 Entry Questions

Salone Hackathon 2019 Entry Questions Solutions

###1. FIND THE LONGEST WORD
["hello", "world", "hi", "bye"]

###Solution:
Given that there is only one longest word in the Array or the first longest word is a valid
```kotlin
    fun findLongestWord(words: List<String>): String {
        var longestWord = ""
        words.onEach { word -> if(word.length > longestWord.length) longestWord = word }
        return longestWord
    }
```
Test:
```kotlin
fun main() {
  val words = listOf("hello", "world", "hi", "bye")
	println("Longest word: ${findLongestWord(words)}")
}
```


###2. RETURN ALL ODDS
[1, 2, 3, 4, 5, 7]
```kotlin
    fun filterOdd(numbers: List<Int>): List<Int> {
        return numbers.filter { num -> num % 2 != 0}
    }
```


###3. SORT DICTIONARY/MAP BASED ON KEY
{"key": "value", "ab": "hi there", "we": "say what"}
```kotlin
 fun filterKeys(values: Map<String, String>): Map<String, String> {
        return values.filterKeys { key -> key.isNotEmpty() }
    }
```

###4. READING A FILE
read a file called helloworld.txt and return line #10
//TODO:

###5. READ A CSV FILE
you have a csv file called helloworld.txt with the following data in it
hi,bye,there,3
go,there,hi,3
hi,bye,there,4

Assuming the CVS file as been parsed to a line of String..
```kotlin
    fun MutableMap<String, Int>.addOrUpdateMap(line: String){
        val list = line.split(",")
        var value = list[list.size - 1].toInt()
        val key = list.joinToString(limit = 3, separator = ",")       
        if (this.containsKey(key)) {
            value += this.get(key) ?: 0
        }
        this.put(key, value)
        println("Map $this")
    }
```