FUNDAMENTALS
You are given an array(list) strarr
of strings and an integer k
. Your task is to return the first longest string consisting of k consecutive strings taken in the array.
Examples:
strarr = ["tree", "foling", "trashy", "blue", "abcdef", "uvwxyz"], k = 2
Concatenate the consecutive strings of strarr by 2, we get:
treefoling (length 10) concatenation of strarr[0] and strarr[1]
folingtrashy (" 12) concatenation of strarr[1] and strarr[2]
trashyblue (" 10) concatenation of strarr[2] and strarr[3]
blueabcdef (" 10) concatenation of strarr[3] and strarr[4]
abcdefuvwxyz (" 12) concatenation of strarr[4] and strarr[5]
Two strings are the longest: "folingtrashy" and "abcdefuvwxyz".
The first that came is "folingtrashy" so
longest_consec(strarr, 2) should return "folingtrashy".
In the same way:
longest_consec(["zone", "abigail", "theta", "form", "libe", "zas", "theta", "abigail"], 2) --> "abigailtheta"
n being the length of the string array, if n = 0
or k > n
or k <= 0
return "" (return Nothing
in Elm, "nothing" in Erlang).
Note
consecutive strings : follow one after another without an interruption
const longestConsec = (strarr, k) => {
let longestWord = ''
for (let i = 0; i <= strarr.length - k; i++) {
const wordsJoined = strarr.slice(i, i + k).join('')
if (wordsJoined.length > longestWord.length) longestWord = wordsJoined
}
return k > 0 ? longestWord : ''
}