Tutorial by Examples: e

The Foundation framework provides the Operation type, which represents a high-level object that encapsulates a portion of work that may be executed on a queue. Not only does the queue coordinate the performance of those operations, but you can also establish dependencies between operations, create c...

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public class SignUpActivity extends BaseAppCompatActivity { @BindView(R.id.tIETSignUpEmail) EditText mEditEmail; @BindView(R.id.tIETSignUpPassword) EditText mEditPassword; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCrea...

public class LoginActivity extends BaseAppCompatActivity { @BindView(R.id.tIETLoginEmail) EditText mEditEmail; @BindView(R.id.tIETLoginPassword) EditText mEditPassword; @Override protected void onResume() { super.onResume(); FirebaseUser firebaseUs...

public class ForgotPasswordActivity extends AppCompatActivity { @BindView(R.id.tIETForgotPasswordEmail) EditText mEditEmail; private FirebaseAuth mFirebaseAuth; private FirebaseAuth.AuthStateListener mAuthStateListener; @Override protected void onCreate(Bundle saved...

public class ChangeEmailActivity extends BaseAppCompatActivity implements ReAuthenticateDialogFragment.OnReauthenticateSuccessListener { @BindView(R.id.et_change_email) EditText mEditText; private FirebaseUser mFirebaseUser; @OnClick(R.id.btn_change_email) void onChangeE...

public class ChangePasswordActivity extends BaseAppCompatActivity implements ReAuthenticateDialogFragment.OnReauthenticateSuccessListener { @BindView(R.id.et_change_password) EditText mEditText; private FirebaseUser mFirebaseUser; @OnClick(R.id.btn_change_password) void on...

public class ReAuthenticateDialogFragment extends DialogFragment { @BindView(R.id.et_dialog_reauthenticate_email) EditText mEditTextEmail; @BindView(R.id.et_dialog_reauthenticate_password) EditText mEditTextPassword; private OnReauthenticateSuccessListener mOnReauthenticat...

Setting Up the database public class DatabaseHelper extends SQLiteOpenHelper { // Database Version private static final int DATABASE_VERSION = 1; // Database Name private static final String DATABASE_NAME = "database_name"; // Table Names private static...

Hadoop Distributed File System (HDFS) is a Java-based file system that provides scalable and reliable data storage that is designed to span large clusters of commodity servers. HDFS, MapReduce, and YARN form the core of Apache™ Hadoop®. HDFS is designed to be highly fault-tolerant, which is achieve...

You can combine the results of two identically structured queries with the UNION keyword. For example, if you wanted a list of all contact info from two separate tables, authors and editors, for instance, you could use the UNION keyword like so: select name, email, phone_number from authors u...

The remainder operator in Julia is the % operator. This operator behaves similarly to the % in languages such as C and C++. a % b is the signed remainder left over after dividing a by b. This operator is very useful for implementing certain algorithms, such as the following implementation of the Si...

So you want to deploy your app to multiple sites? and your project has too many dependencies to install them one-by-one? Npm has a solution just issue the following command: npm init In the project's root folder then follow the instructions on screen (type in the desired value then press enter) ...

In many languages, new instances of a class are created using a special new keyword. In Ruby, new is also used to create instances of a class, but it isn't a keyword; instead, it's a static/class method, no different from any other static/class method. The definition is roughly this: class MyClass ...

This example sorts elements in ascending order of a key using a map. You can use any type, including class, instead of std::string, in the example below. #include <iostream> #include <utility> #include <map> int main() { std::map<double, std::string> sorted_map; ...

To detect the endian of the device var isLittleEndian = true; (()=>{ var buf = new ArrayBuffer(4); var buf8 = new Uint8ClampedArray(buf); var data = new Uint32Array(buf); data[0] = 0x0F000000; if(buf8[0] === 0x0f){ isLittleEndian = false; } })(); Lit...

C++11 introduces what are known as scoped enums. These are enumerations whose members must be qualified with enumname::membername. Scoped enums are declared using the enum class syntax. For example, to store the colors in a rainbow: enum class rainbow { RED, ORANGE, YELLOW, GREE...

db.people.createIndex({name: 1}) This creates an ascending single field index on the field name. In this type of indexes the sort order is irrelevant, because mongo can traverse the index in both directions.

To drop an index you could use the index name db.people.dropIndex("nameIndex") Or the index specification document db.people.dropIndex({name: 1})

Pattern matching extensions for C# enable many of the benefits of pattern matching from functional languages, but in a way that smoothly integrates with the feel of the underlying language switch expression Pattern matching extends the switch statement to switch on types: class Geometry {} cl...