[JavaScript] One-line efficient solution ✔💯✅
\nisAcronym = (words, s) => s === words.map( w => w[0]).join(\'\')\n\n\n\nPlease upvote \u21D1, if you find it efficient \uD83E\uDD70
```\nisAcronym = (words, s) => s === words.map( w => w[0]).join(\'\')\n\n```\n\n**Please upvote \u21D1, if you find it efficient \uD83E\uDD70**
['JavaScript']