The latest articles on DEV Community by Maxmiliano Silva de Almeida (@maximiliano). https://dev.to/maximiliano https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F1816617%2F21579495-a31a-4f7f-bf9b-824ee3ae3ac4.jpg https://dev.to/maximiliano en Maxmiliano Silva de Almeida Tue, 15 Oct 2024 22:24:28 +0000 https://dev.to/maximiliano/listof-em-kotlin-manipulando-colecoes-de-forma-simples-e-eficiente-3lbp https://dev.to/maximiliano/listof-em-kotlin-manipulando-colecoes-de-forma-simples-e-eficiente-3lbp <p><strong>Vamos falar um pouco sobre Collections?</strong></p> <p>O uso de collections nos permite armazenar múltiplos valores, que podem ser do mesmo tipo ou não. Hoje, vou falar especificamente sobre a função listOf().</p> <p>Vamos imaginar a criação de uma lista com todos os membros de um clube de motociclistas. Nesta lista, teremos o nome, responsabilidade, apelido e antiguidade (tempo de participação no clube em anos) de cada membro.</p> <p><strong>Começando pela criação de uma data class:</strong></p> <p><a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fjscdeqclra8jizcyh8gv.png" class="article-body-image-wrapper"><img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fjscdeqclra8jizcyh8gv.png" alt="Image description" width="800" height="231"></a></p> <p>Após a criação da nossa classe com os atributos necessários, vamos criar a nossa lista utilizando <strong>listOf()</strong>:</p> <p><a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fo90wmyjg53qa1e7cwrq7.png" class="article-body-image-wrapper"><img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fo90wmyjg53qa1e7cwrq7.png" alt="Image description" width="800" height="347"></a></p> <p>Com a lista criada, podemos utilizar algumas propriedades e métodos do listOf() para obter informações:</p> <ul> <li> <strong>Quantidade de membros:</strong> </li> </ul> <p><a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F8xvu0t8pmwd3r6xpe82s.png" class="article-body-image-wrapper"><img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F8xvu0t8pmwd3r6xpe82s.png" alt="Image description" width="800" height="115"></a></p> <ul> <li><strong>Acessar atributos dos membros usando o índice:</strong></li> </ul> <p><a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fgadnbj1shchnq10i9itx.png" class="article-body-image-wrapper"><img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fgadnbj1shchnq10i9itx.png" alt="Image description" width="800" height="184"></a></p> <ul> <li><strong>Verificar membros com mais de 5 anos de clube:</strong></li> </ul> <p><a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fktninpz64deoknxddsuq.png" class="article-body-image-wrapper"><img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fktninpz64deoknxddsuq.png" alt="Image description" width="800" height="208"></a></p> <p>Essas são apenas algumas das funcionalidades que podemos explorar ao trabalhar com <strong>listOf()</strong> em Kotlin.</p> <p>E aí, curtiu?</p> <p>Até a próxima!</p> android kotlin development