Warning: session_start(): Session cannot be started after headers have already been sent in /home/tvrreohg/public_html/manga.php on line 13
# `unless()` The unless method will execute the given callback when the first argument given to the method evaluates to false: ```js const collection = collect([1, 2, 3]); collection.unless(false, items => items.push(4)); collection.all(); // [1, 2, 3, 4] ``` [View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/unless.js)