Kotlin - Padrões e Boas Práticas

Apresentada no DevFest Belo Horizonte 2017

Transcript

10. User user = new User(); user.setName("Rafael Toledo"); // Obrigatório user.setEmail("rafaeltoledo@email.com"); // Obrigatório user.setPhone("+55 11 99999-9999"); // Opcional
11. User user = new User.Builder("Rafael Toledo", "rafaeltoledo@email.com") .phone("+55 11 99999-9999") .build();
12. class User(val name: String, val email: String, val phone: String? = null) User(name = "Rafael Toledo", email = "rafaeltoledo@email.com")
13. class User(val name: String, val email: String, val phone: String? = null) User(name = "Rafael Toledo", email = "rafaeltoledo@email.com", phone = "+55 11 99999-9999")
14. taxCalculator { country = Tax.COUNTRY_BRAZIL period { from = date("2017-01-01") to = date("2017-10-31") } type = Tax.TYPE_IRPF payment { type = Tax.PAYMENT_BANK_TRANSFER bank { agency = "1234" account = "012345-9" ...
16. fun ViewGroup.inflate(layoutRes: Int, attachToRoot: Boolean = false): View { return LayoutInflater.from(context).inflate(layoutRes, this, attachToRoot) }
22. validateAddress(addressFrom(jsonNode)) validateAddress(jsonNode.toAddress()) private fun JsonNode.toAddress() = Address( getRequired("street").asText(), getRequired("town").asText(), get("postcode")?.asPostCode(), getRequired("country").asCountryCode())
23. validateAddress(addressFrom(jsonNode)) validateAddress(jsonNode.toAddress()) private fun JsonNode.toAddress() = Address( getRequired("street").asText(), getRequired("town").asText(), get("postcode")?.asPostCode(), getRequired("country").asCountryCode())
24. // Antes enableCheckbox(isFreeDelivery(addressFrom(jsonNode))) // Depois enableCheckbox(jsonNode.toAddress().isFreeDelivery())
25. // Antes if (userCanEditSubmission(currentUser, submission)) { ... } // After if (currentUser.canEdit(submission)) { ... }
36. if (savedInstanceState != null) { ... } savedInstanceState?.let { ... }
39. // Confuso if (value?.isTrue ?: false) { ... } // Parece redundante, mas é mais claro! if (value?.isTrue == true) { ... }
54. @Deprecated("Use X instead") @Throws(ExceptionInInitializerError::class) fun relevantMethod() { ... }
56. // Em vez de apply plugin: "kotlin-android" apply plugin: "kotlin-android-extensions" // Por que não... apply plugin: "org.jetbrains.kotlin.android" apply plugin: "org.jetbrains.kotlin.android.extensions" apply plugin: "org.jetbrains.kotlin.kapt"