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data class DownloadItem(
    val bytesDownloadedSoFar: Long = -1,
    val totalSizeBytes: Long = -1,
    val status: Int,
    val uri: String
)

class DownloadProgressLiveData(private val activity: Activity) :
    LiveData<List<DownloadItem>>(),
    CoroutineScope {

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Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

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Array

• Two Sum
• Best Time to Buy and Sell Stock
• Contains Duplicate
• Product of Array Except Self
• Maximum Subarray
• Maximum Product Subarray
• Find Minimum in Rotated Sorted Array

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Lesson 1 - Iterations
- BinaryGap - https://codility.com/demo/results/trainingU2FQPQ-7Y4/

Lesson 2 - Arrays
- OddOccurrencesInArray - https://codility.com/demo/results/trainingFN5RVT-XQ4/
- CyclicRotation - https://codility.com/demo/results/trainingSH2W5R-RP5/

Lesson 3 - Time Complexity
- FrogJmp - https://codility.com/demo/results/training6KKWUD-BXJ/
- PermMissingElem - https://codility.com/demo/results/training58W4YJ-VHA/

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Basic React Gotchas

Note: This document was written for someone who already knows React fairly well, because it was initially a list of suggested talking points for a presentation they were planning. Ideally this document should be expanded to include clear examples for the final target audience, which is React beginners.

setState does not apply the update immediately

// Constructor
this.state = { foo: 0 };

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function countChange(money, coins) {
  if (money == 0) return 1;
  if (money < 0 || coins.length == 0) return 0;
  return countChange(money - coins[0], coins) + countChange(money, coins.slice(1));
}

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function numberToOrdinal(i) {
  var j = i % 10,
      k = i % 100;
  if (j == 1 && k != 11) {
      return i + "st";
  }
  if (j == 2 && k != 12) {
      return i + "nd";
  }
  if (j == 3 && k != 13) {

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/**
 * we are going to upload file to s3 via node js by using
 * aws-sdk - required
 * busboy -  required
 * uuid - optional - for image renaming purpose
 * with this library you can upload any kind of file to s3 via node js.
 */

const AWS = require('aws-sdk');
const UUID = require('uuid/v4');

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// Some common IE shims... indexOf, startsWith, trim

/*
  Really? IE8 Doesn't have .indexOf
*/
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
    "use strict";
    if (this === null) {
      throw new TypeError();

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// [B](f: (A) ⇒ [B]): [B]  ; Although the types in the arrays aren't strict (:
Array.prototype.flatMap = function(lambda) { 
    return Array.prototype.concat.apply([], this.map(lambda)); 
};