Google Android Play Store Target API Requirement Change

From Google:

Hello Google Play Developer,

This is a reminder that starting November 1, 2019, updates to apps and games on Google Play will be required to target Android 9 (API level 28) or higher. After this date, the Play Console will prevent you from submitting new APKs with a targetSdkVersion less than 28.

Configuring your app to target a recent API level ensures that users benefit from significant security and performance improvements, while still allowing your app to run on older Android versions (down to the minSdkVersion).

Android 9 (API level 28) introduces a number of changes to the Android system. The following behavior changes apply exclusively to apps that are targeting API level 28 or higher. Apps that set targetSdkVersion to API level 28 or higher must modify their apps to support these behaviors properly, where applicable to the app.

To target the api in your Cordova app set these min and target version in config.xml

    <preference name="android-minSdkVersion" value="23" />
    <preference name="android-targetSdkVersion" value="28" />

How to Set proper Rules on Google Firebase DB

How to Set proper Rules on Google Firebase DB:

Here is an example of a pretty simple rules setting. We don’t want just anyone to access user information. The users sub directory is restricted to the user logged in. The rest is fully restricted and is only accessible via admin api.

service cloud.firestore {
  match /databases/{database}/documents {
    // Make sure the uid of the requesting user matches name of the user
    // document. The wildcard expression {userId} makes the userId variable
    // available in rules.
    match /someusercollection/{userID}/{document=**} {
      allow read, update, delete: if request.auth.uid == userId;
      allow create: if request.auth.uid != null;
    }
    match /somecollection/{document=**} {
      allow read, update, delete, create: if false;
    }
  }
}

Read more on the Firebase Docs.

How to Implement Binary Search in JavaScript


function binarySearch (list, value) {
  // initial values for start, middle and end
  let start = 0
  let stop = list.length - 1
  let middle = Math.floor((start + stop) / 2)

  // While the middle is not what we're looking for and the list does not have a single item
  while (list[middle] !== value && start < stop) {
    if (value < list[middle]) {
      stop = middle - 1
    } else {
      start = middle + 1
    }

    // recalculate middle on every iteration
    middle = Math.floor((start + stop) / 2)
  }

  // if the current middle item is what we're looking for return it's index, else return -1
  return (list[middle] !== value) ? -1 : middle
}

const list = [2, 5, 8, 9, 13, 45, 67, 99]
console.log(binarySearch(list, 99)) // 7 -> returns the index of the item