CodingBat/Java/Map-2/WordAppend.java at master · pauldpearson/CodingBat · GitHub

10 lines (8 loc) · 393 Bytes

Loop over the given array of strings to build a result string like this: when a string appears the 2nd, 4th, 6th, etc. time in the array, append the string to the result. Return the empty string if no string appears a 2nd time.
wordAppend(["a", "b", "a"]) → "a"
wordAppend(["a", "b", "a", "c", "a", "d", "a"]) → "aa"
wordAppend(["a", "", "a"]) → "a"
public class WordAppend {