package main
import (
"fmt"
)
// groupByFirstLetter groups words by their first character.
func groupByFirstLetter(words []string) map[string][]string {
groups := make(map[string][]string)
for _, word := range words {
// Extract the first letter as a string (Go doesn't have char keys like Python)
first := string(word[0])
// Append the word to the slice for this letter.
// If the key doesn't exist yet, Go treats the slice as nil,
// and append automatically creates a new underlying array.
groups[first] = append(groups[first], word)
}
return groups
}
func main() {
// List of words to group
words := []string{
"Python", "JavaScript", "C", "Java", "C#", "PHP",
"C++", "Pascal", "SQL", "Rust",
}
grouped := groupByFirstLetter(words)
// Print each group
for letter, group := range grouped {
fmt.Printf("%s: %v\n", letter, group)
}
// Print the entire map
fmt.Println(grouped)
}
/*
run:
P: [Python PHP Pascal]
J: [JavaScript Java]
C: [C C# C++]
S: [SQL]
R: [Rust]
map[C:[C C# C++] J:[JavaScript Java] P:[Python PHP Pascal] R:[Rust] S:[SQL]]
*/
