/**
* Groups an array of words by their first letter.
*
* @param words - The list of words to group
* @returns A dictionary where each key is a letter and each value is an array of words
*/
function groupByFirstLetter(words: string[]): Record<string, string[]> {
const groups: Record<string, string[]> = {}; // Typed dictionary
for (const word of words) {
const firstLetter = word[0]; // Extract first letter
// If the key doesn't exist yet, create an empty array
if (!groups[firstLetter]) {
groups[firstLetter] = [];
}
// Add the word to its group
groups[firstLetter].push(word);
}
return groups;
}
// List of words to group
const words: string[] = [
"Python", "JavaScript", "C", "Java", "C#", "PHP",
"C++", "Pascal", "SQL", "Rust"
];
const groupedWords: Record<string, string[]> = groupByFirstLetter(words);
// Print each group
for (const letter in groupedWords) {
console.log(`${letter}: [${groupedWords[letter].join(", ")}]`);
}
// Print the entire dictionary
console.log(groupedWords);
/*
run:
"P: [Python, PHP, Pascal]"
"J: [JavaScript, Java]"
"C: [C, C#, C++]"
"S: [SQL]"
"R: [Rust]"
{
"P": [
"Python",
"PHP",
"Pascal"
],
"J": [
"JavaScript",
"Java"
],
"C": [
"C",
"C#",
"C++"
],
"S": [
"SQL"
],
"R": [
"Rust"
]
}
*/
