object GroupWordsApp {
/**
* Groups words by their first letter.
*
* @param words A sequence of words to group
* @return A Map where each key is a first letter and each value is a list of words
*/
def groupByFirstLetter(words: Seq[String]): Map[Char, Seq[String]] = {
// groupBy creates a Map[Char, Seq[String]]
// _.head extracts the first character of each word
words.groupBy(_.head)
}
def main(args: Array[String]): Unit = {
// List of words to group
val words = Seq(
"Python", "JavaScript", "C", "Java", "C#", "PHP",
"C++", "Pascal", "SQL", "Rust"
)
val grouped = groupByFirstLetter(words)
// Print each group
for ((letter, group) <- grouped) {
println(s"$letter: [${group.mkString(", ")}]")
}
// Print the entire map
println(grouped)
}
}
/*
run:
J: [JavaScript, Java]
P: [Python, PHP, Pascal]
C: [C, C#, C++]
R: [Rust]
S: [SQL]
HashMap(J -> List(JavaScript, Java), P -> List(Python, PHP, Pascal), C -> List(C, C#, C++), R -> List(Rust), S -> List(SQL))
*/
