Audhil

DOM(https://youtu.be/ipkjfvl40s0) - Document Object Model
object as a tree structure
DOM is an object-oriented representation of web page


Component(https://youtu.be/16rQyEQtpyQ?list=PLC3y8-rFHvwhBRAgFinJR8KHIrCdTkZcZ):
  Template(view/HTML) + Class(code/typescript/data&methods) + Metadata(information decorator)

  3 ways of declaring selector
    1 -> selector: 'app-badwords' -> <app-badwords></app-badwords> in html file

Audhil

//  https://youtu.be/VWlwkqmTLHc?list=PLQkwcJG4YTCQcFEPuYGuv54nYai_lwil_
        //  USING TRY-CATCH FOR EXCEPTION HANDLING
        //  wrong
        lifecycleScope.launch {
            try {
                launch {
                    throw Exception("failed")
                }
            } catch (e: Exception) {
            }

Audhil

class DummyActivity : AppCompatActivity(R.layout.activity_dummy) {

    private val btn by lazy {
        findViewById<Button>(R.id.btn)
    }

    private val tv by lazy {
        findViewById<TextView>(R.id.tv)
    }
    var aToFragCallback: ActivityToFragCallBack<String>? = null

Audhil

//  exploring funcs & props usage in gradle file
//  below code is placed in app/build.gradle
//  executed tasks as `$ ./gradlew showMagics`
//  https://medium.com/@dmitriileonov/5-gradle-things-that-get-android-developers-confused-ed606b8e8c92
class Foo {
    def name = ""

    void name(String newString) {
        name = newString
        println "Foo.name() triggered: name: $newString"

Audhil

package com.bhnetwork.scanit.consumer

import kotlinx.coroutines.*
import kotlin.random.Random

//  mistake 1 - getFirstName call happens one after another
suspend fun getUserFirstNames(userIds: List<String>): List<String> {
    val firstNames = mutableListOf<String>()
    userIds.forEach {
        firstNames.add(getFirstName(it))

Audhil

<?xml version="1.0" encoding="UTF-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:color="@color/black_10"
    tools:targetApi="lollipop"><!-- ripple effect color -->

    <!-- background color -->
    <item android:id="@android:id/background">
        <shape android:shape="rectangle">
            <solid android:color="@android:color/transparent" />

Audhil

class DynamicHomeFragment : Fragment() {
  
  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val color2 = requireActivity().application.resources.getColor(R.color.your_special_color, null) //  returns Color.GREEN
        binding.content.ll3.setBackgroundColor(color2)
  }
}

Audhil

//
//  ContentView.swift
//  SwiftUI-Appu
//
//  Created by Mohammed Audhil S on 18/04/21.
//

import SwiftUI

struct ContentView: View {

Audhil

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.navigation_activity)
        val toolbar = findViewById<Toolbar>(R.id.toolbar)
        setSupportActionBar(toolbar)

        val host: NavHostFragment = supportFragmentManager
                .findFragmentById(R.id.my_nav_host_fragment) as NavHostFragment? ?: return

Audhil

Designing Swiggy-app!

requirements
Kotlin
MVVM - MVI etc
android arch components
Dagger-Hilt, MockK
retrofit2
kotlin coroutines