Ayush Gupta

On a way of becoming Android Developer | Currently learning Kotlin

[Ayush Gupta @AyushGupta1371]

Today, I learned about function composition. A function can be passed as argument to other function's parameter and can be returned as function.

fun (a : (Int)->Int) : (Int)->Int{ return a(it)} //this will return a function of type (Int -> Int)

#kotlin #android #jetpackcompose

[Ayush Gupta @AyushGupta1371]

In Kotlin, there is 2 ways to define a function without name. First one is Anonymous function looks like this fun (a : Int, b : Int) = a * b and second one is Lambda expression which looks like this val sum = {a : Int, b : Int -> a + b}.

#kotlin #jetpackcompose #androiddeveloper

[Ayush Gupta @AyushGupta1371]

Today, I learned about JSON and JSON Moshi Library which helps to Serialize the Kotlin object into JSON and Deserialize from JSON to Kotlin object.

Moshi library is lightweight-fast speed and size is just about 100 KB .

#kotlin #android #androiddeveloper

[Ayush Gupta @AyushGupta1371]

Today, I learned about Date & Time Library in Kotlin which provide Instant, LocalDateTime & LocalDate.
#kotlin #jetpackcompose #android #androiddeveloper

[Ayush Gupta @AyushGupta1371]

Pair and Triple classes allows to directly created class for Any types of data in Kotlin.

#kotlin #androiddeveloper #android #learninpublic

[Ayush Gupta @AyushGupta1371]

Today, I learned about data class which provide data-oriented methods like copy() & componentN(), and modified implementation of toString(), equals() & hashCode().

#kotlin #android #androiddeveloper #learninpublic

[Ayush Gupta @AyushGupta1371]

Today, I learned about lazy initialization and lateinit in kotlin. Lazy variable initialized when accessed first time, & lateinit is value will provided later for initialization.

#kotlin #android #learninpublic

[Ayush Gupta @AyushGupta1371]

Object declaration in Kotlin is creating a singleton object which have only one instance in whole program and has a global access point.

[Ayush Gupta @AyushGupta1371]

I completed Minesweeper project without any help. just a blank screen and my knowledge and brain.
@yourhyperskill @JetBrains_Edu @jetbrains @kotlin
https://t.co/CBd0r8GF5N

[Ayush Gupta @AyushGupta1371]

Today i learned about 5 standard property delegation in @kotlin - lazy, observable, vetoable, notNull, map delegation

#kotlin #android #androiddeveloper #jetpackcompose #learninpublic

[Ayush Gupta @AyushGupta1371]

In Kotlin, an observable property is a type of property that triggers a lambda function every time its value changes.

[Ayush Gupta @AyushGupta1371]

In Kotlin, a lazy property is a type of delegated property that delays the initialization of a property until it is first accessed.

[Ayush Gupta @AyushGupta1371]

Note for myself: Interface can be describe as IS-A relationship and Delegation can be describe as HAS-A relationship.

#kotlin #android #androiddeveloper #learninpublic

[Ayush Gupta @AyushGupta1371]

The keyword by is used in Kotlin to delegate the implementation of an interface or functionality of one class to another class.

[Ayush Gupta @AyushGupta1371]

Delegation in Kotlin is basically delegate a interface by object which implemented that interface.

#kotlin #androiddeveloper #jetbrains #learninpublic

[Ayush Gupta @AyushGupta1371]

I made a Command-Line project named "Chuck Norris Cipher Encoder" using Kotlin. I used concepts like while loops, when, if-else, encoding-decoding, binary numbers etc.
Source Code - https://t.co/Yc3dIC2lSa

[Ayush Gupta @AyushGupta1371]

Five Creational Design Patterns:
Factory Method,
Singleton,
Prototype,
Abstract Fatory,
Builder

#Kotlin #Android
#AndroidDeveloper #JetpackCompose

[Ayush Gupta @AyushGupta1371]

Today, I learned about Interfaces Segregation Principle which is about classes which implement interface shouldn't have force to implement every methods and properties unnecssarily. interfaces should be divided into related responsibilities.

#Kotlin #Android
#AndroidDeveloper

[Ayush Gupta @AyushGupta1371]

Today, I learned about Single Responsibility Principle which is about a class, function and module should have one reason to change. We should keep related responsibilities together and separate unrelated responsibilities.

#Kotlin #Android
#AndroidDeveloper #JetpackCompose

[Ayush Gupta @AyushGupta1371]

After learning about Code Organisation and Design Principles like DRY, YAGNI, KISS & SOLID. I understood working code alone is not enough, when software complexity arise we need to organise code properly for other developers.