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# `whenEmpty()` The `whenEmpty` method will execute the given callback when the collection is empty: ```js const collection = collect([]); collection.whenEmpty(c => c.push('Mohamed Salah')); collection.all(); // ['Mohamed Salah'] ``` ```js const collection = collect(['Darwin Núñez']); collection.whenEmpty( c => c.push('Mohamed Salah'), c => c.push('Xherdan Shaqiri'), ); collection.all(); // [ // 'Darwin Núñez', // 'Xherdan Shaqiri', // ]; ``` [View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/whenEmpty.js)