Coding problem · Easy · Basics

Make an Acronym

Easy Algorithms & data structures

Given a phrase of words separated by single spaces, return its acronym: the first letter of each word, upper-cased.

"portable network graphics" becomes "PNG".

Example 1

Input: phrase = "portable network graphics"
Output: "PNG"

Example 2

Input: phrase = "as soon as possible"
Output: "ASAP"

Hints

Hint 1

Split the phrase into words and take the first character of each.

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Solution and explanation

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Time O(n) · Space O(n)

Map each word to its first letter, join them, and upper-case the result.

Reference solution

function acronym(phrase) {
  return phrase.split(' ').map((w) => w[0]).join('').toUpperCase();
}

function acronym(phrase: string): string {
  return phrase.split(' ').map((w) => w[0]).join('').toUpperCase();
}

def acronym(phrase: str) -> str:
    return ''.join(w[0] for w in phrase.split(' ')).upper()

<?php

function acronym(string $phrase): string
{
    return strtoupper(implode('', array_map(fn ($w) => $w[0], explode(' ', $phrase))));
}

class Solution {
    public String acronym(String phrase) {
        StringBuilder sb = new StringBuilder();
        for (String w : phrase.split(" ")) sb.append(w.charAt(0));
        return sb.toString().toUpperCase();
    }
}

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