Isogram

Challenge Overview

Determine if a word or phrase is an isogram.

Visit the isogram exercise on Exercism to read the full instructions and download the exercise files.

Community Solutions

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The following are the top 3 community solutions by stars:

Solution 1 by @glennj (⭐ 1) — View on Exercism
Solution 2 by @avysk (⭐ 0) — View on Exercism
Solution 3 by @mengdaming (⭐ 0) — View on Exercism

Source: Exercism awk/isogram

💡 View Solution

BEGIN { FS = "" }     

{
    $0 = gensub(/[^[:alpha:]]/, "", "g", tolower($0))

    delete seen
    result = "true"
    for (i = 1; i <= NF; i++) {
        if (seen[$i]++) {
            result = "false"