rafsanahmad

import kotlin.math.roundToInt

data class User(
    val id: Int,
    val name: String,
    val webDev: Boolean = false,
    val mobileDev: Boolean = false
)

data class Product(val name: String, val quantity: Int, val price: Double)

rafsanahmad

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(1)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

rafsanahmad

abstract class EndlessRecyclerOnScrollListener(
    private val threshHold: Int = QUERY_PER_PAGE
) : RecyclerView.OnScrollListener() {

    var isError = false
    var isLoading = false
    var isLastPage = false
    var isScrolling = false
    private var firstVisibleItem: Int = 0
    private var visibleItemCount: Int = 0

rafsanahmad

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.Context;
import android.content.res.ColorStateList;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.Matrix;

rafsanahmad

import java.util.regex.Pattern;

public class PasswordUtil {

    private static String MsgLen8 = "String Must be 8 characters long";
    private static String MsgUpper = "Must contain at least one upper case letter";
    private static String MsgLower = "Must contain at least one lower case letter";
    private static String MsgDigit = "Must contain at least one digit";
    private static String MsgSp = "Must contain at least one special character from this list: !@#$%^&*()+-.,\"'(){}[]:;?/\\";
    private static Pattern pattern = Pattern.compile("^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%^&*()+=])(?=\\\\S+$).{4,}$");