vxhviet

Source: Cedric's blog, EricLin, Cedric's blog

For some in depth explanation on these standard functions and Function Literal with Receiver see KotlinExpertise and coding convention for apply/with/run/also/let.

Quick overview of some important funtion in Kotlin's standard library

let()

fun  T.let(f: (T) -> R): R = f(this)```

felipecsl

import com.fasterxml.jackson.core.type.TypeReference
import com.fasterxml.jackson.databind.ObjectMapper
import org.gradle.api.Task
import org.gradle.api.Project
import org.gradle.api.UnknownTaskException
import org.gradle.api.GradleException
import org.gradle.api.plugins.ExtraPropertiesExtension

@SuppressWarnings("UNCHECKED_CAST")
fun <T> Project.ext(key: String): T {

TWiStErRob

Notes:

• The file name has to end in .main.kts and kotlin-main-kts.jar has to be on classpath. See https://youtrack.jetbrains.com/issue/KT-27853
• Transitive dependencies have to be explicitly listed, and version conflicts manually resolved by hard-coding the right versions.

kotlinc: https://kotlinlang.org/docs/tutorials/command-line.html

To edit this in IntelliJ IDEA:

• create and idea folder next to the .kts file
• save build.gradle to that folder
• import the project from idea/build.gradle.

bradtraversy

MySQL Cheat Sheet

Help with SQL commands to interact with a MySQL database

MySQL Locations

• Mac /usr/local/mysql/bin
• Windows /Program Files/MySQL/MySQL version/bin
• Xampp /xampp/mysql/bin

Add mysql to your PATH

bradtraversy

MongoDB Cheat Sheet

Show All Databases

show dbs

Show Current Database

mitchtabian

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.fragment.app.Fragment
import dagger.hilt.android.AndroidEntryPoint
import javax.inject.Inject

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {

    @Inject

gmk57

/**
 * Coroutine-based solution for delayed and periodic work. May fire once (if [interval] omitted)
 * or periodically ([startDelay] defaults to [interval] in this case), replacing both
 * `Observable.timer()` & `Observable.interval()` from RxJava.
 *
 * In contrast to RxJava, intervals are calculated since previous run completion; this is more
 * convenient for potentially long work (prevents overlapping) and does not suffer from queueing
 * multiple invocations in Doze mode on Android.
 *
 * Dispatcher is inherited from scope, may be overridden via [context] parameter.

pradhuman-soni

Q. What are some examples of collections ?
A. Lists, Arrays, Maps, Sets are collections.

Q. How many types of lists are there?
A. Lists are of two types : Mutable Lists and Immutable Lists.

Q. What is a map?
A. A map is a collection that holds and key and a value pair.

Q. What datatypes can be stored in collections?

Matikano

1.  MVI BaseViewModel (mviBaseVm) -Creates an abstract class for MVI BaseViewModel; Reuqires UiAction and UiEvent marker interfaces:

import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.channels.Channel
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.onStart
import kotlinx.coroutines.flow.receiveAsFlow
import kotlinx.coroutines.flow.stateIn