Merge 67261bfd41 into 8557d4f3d8

adding the at() method

README.md

@@ -89,6 +89,7 @@ Feel free to take a look. You might learn new things. They have been designed to
 #### SQL
 
 - [MySQL](databases/mysql.sh)
+- [PostgreSQL](databases/postgresql.md)
 
 #### NoSQL
 
@@ -124,6 +125,7 @@ Feel free to take a look. You might learn new things. They have been designed to
 - [Nginx](tools/nginx.sh)
 - [PM2](tools/pm2.sh)
 - [Ubuntu](tools/ubuntu.sh)
+- [Firebase CLI](tools/firebase_cli.md)
   </details>
 
 ## 🙌🏼 How to Contribute?

backend/laravel.php

@@ -8,6 +8,8 @@
 // MAIN.
 
 php artisan clear-compiled       // Remove the compiled class file
+php artisan db                   // Start a new database CLI session
+php artisan docs                 // Access the Laravel documentation
 php artisan down                 // Put the application into maintenance mode
 php artisan dump-server          // Start the dump server to collect dump information.
 php artisan env                  // Display the current framework environment
@@ -43,6 +45,9 @@ php artisan config:clear         // Remove the configuration cache file
 // DB
 
 php artisan db:seed              // Seed the database with records
+php artisan db:show              // Display information about the given database
+php artisan db:table             // Display information about the given database table
+php artisan db:wipe              // Drop all tables, views, and types
 
 // EVENT
 
@@ -54,9 +59,10 @@ php artisan key:generate         // Set the application key
 
 // MAKE
 
-php artisan make:auth            // Scaffold basic login and registration views and routes
+php artisan make:cast            // Create a new custom Eloquent cast class
 php artisan make:channel         // Create a new channel class
 php artisan make:command         // Create a new Artisan command
+php artisan make:component       // Create a new view component class
 php artisan make:controller      // Create a new controller class
 php artisan make:event           // Create a new event class
 php artisan make:exception       // Create a new custom exception class
@@ -74,6 +80,7 @@ php artisan make:provider        // Create a new service provider class
 php artisan make:request         // Create a new form request class
 php artisan make:resource        // Create a new resource
 php artisan make:rule            // Create a new validation rule
+php artisan make:scope           // Create a new scope class
 php artisan make:seeder          // Create a new seeder class
 php artisan make:test            // Create a new test class
 
@@ -86,6 +93,10 @@ php artisan migrate:reset        // Rollback all database migrations
 php artisan migrate:rollback     // Rollback the last database migration
 php artisan migrate:status       // Show the status of each migration
 
+// MODEL
+php artisan model:prune          // Prune models that are no longer needed
+php artisan model:show           // Show information about an Eloquent model
+
 // NOTIFICATIONS
 
 php artisan notifications:table  // Create a migration for the notifications table
@@ -100,13 +111,19 @@ php artisan package:discover     // Rebuild the cached package manifest
 
 // QUEUE
 
+php artisan queue:batches-table  // Create a migration for the batches database table
+php artisan queue:clear          // Delete all of the jobs from the specified queue
 php artisan queue:failed         // List all of the failed queue jobs
 php artisan queue:failed-table   // Create a migration for the failed queue jobs database table
 php artisan queue:flush          // Flush all of the failed queue jobs
 php artisan queue:forget         // Delete a failed queue job
 php artisan queue:listen         // Listen to a given queue
+php artisan queue:monitor        // Monitor the size of the specified queues
+php artisan queue:prune-batches  // Prune stale entries from the batches database
+php artisan queue:prune-failed   // Prune stale entries from the failed jobs table
 php artisan queue:restart        // Restart queue worker daemons after their current job
 php artisan queue:retry          // Retry a failed queue job
+php artisan queue:retry-batch    // Retry the failed jobs for a batch
 php artisan queue:table          // Create a migration for the queue jobs database table
 php artisan queue:work           // Start processing jobs on the queue as a daemon
 
@@ -116,9 +133,26 @@ php artisan route:cache          // Create a route cache file for faster route r
 php artisan route:clear          // Remove the route cache file
 php artisan route:list           // List all registered routes
 
+// SAIL
+
+php artisan sail:install         // Install Laravel Sail's default Docker Compose file
+php artisan sail:publish         // Publish the Laravel Sail Docker files
+
+// SANCTUM
+
+php artisan sanctum:prune-expired // Prune tokens expired for more than specified number of hours.
+
 // SCHEDULE
 
-php artisan schedule:run         // Run the scheduled commands
+php artisan schedule:clear-cache  // Delete the cached mutex files created by scheduler
+php artisan schedule:list         // List the scheduled commands
+php artisan schedule:run          // Run the scheduled commands
+php artisan schedule:test         // Run a scheduled command
+php artisan schedule:work         // Start the schedule worker
+
+// SCHEMA
+
+php artisan schema:dump           // Dump the given database schema
 
 // SESSION
 
@@ -128,6 +162,10 @@ php artisan session:table        // Create a migration for the session database
 
 php artisan storage:link         // Create a symbolic link from "public/storage" to "storage/app/public"
 
+// STUD
+
+php artisan stub:publish         // Publish all stubs that are available for customization
+
 // VENDOR
 
 php artisan vendor:publish       // Publish any publishable assets from vendor packages

databases/postgresql.md

@@ -0,0 +1,494 @@
+## ❄ PostgreSQL CHEAT SHEET
+
+### 🧐 What is PostgreSQL?
+`PostgreSQL/Postgres` is a free open-source relational database management system(RDBMS) emphasizing extensibility and SQL compliance. It was originally named `POSTGRES`, referring to it's origins as a successor to the Ingres database developed at the University of California, Berkeley.
+
+### 🤔 What is the use of PostgreSQL?
+It is a highly stable database management  system, backend by more than 20 years of community development which has contributed to it's high levels of resilience, integrity, and correctness. PostgreSQL is used as the primary data store or data warehouse for many web, mobile, geospatial, and analytics applications.
+
+## 📚 PostgreSQL Table of Contents 
+
+### 1️⃣ QUERYING DATA FROM A TABLE
+<details>
+<summary>View Queries</summary>
+
+```
+SELECT c1, c2 FROM t;  
+```
+Query data in columns c1, c2 from a table
+<hr>
+
+```
+SELECT * FROM t;
+```
+Query all rows and columns from a table
+<hr>
+
+```
+SELECT c1, c2 FROM t
+WHERE condition;
+```
+Query data and filter rows with a condition
+<hr>
+
+```
+SELECT DISTINCT c1 FROM t
+WHERE condition;
+```
+Query distinct rows from a table
+<hr>
+
+```
+SELECT c1, c2 
+FROM t
+ORDER BY c1 ASC[DESC];
+```
+Sort the result set in ascending or descending order
+<hr>
+
+```
+SELECT c1, c2 
+FROM t
+ORDER BY c1
+LIMIT n OFFSET offset;
+```
+Skip offset of rows and return the next n rows
+<hr>
+
+```
+SELECT c1, aggregate(c2)
+FROM t
+GROUP BY c1;
+```
+Group rows using in aggregate function
+<hr>
+
+```
+SELECT c1, aggregate(c2)
+FROM t
+GROUP BY c1
+HAVING condition;
+```
+Filter groups using HAVING clause
+</details>
+
+### 2️⃣ QUERYING FROM MULTIPLE TABLES
+<details>
+<summary>View Queries </summary>
+
+```
+SELECT c1, c2 
+FROM t1
+INNER JOIN t2 ON condition;
+```
+Inner join t1 and t2
+<hr>
+
+```
+SELECT c1, c2
+FROM t1
+LEFT JOIN t2 ON condition;
+```
+Left join t1 and t1
+<hr>
+
+```
+SELECT c1, c2
+FROM t1
+RIGHT JOIN t2 ON condition;
+```
+Right join t1 and t2
+<hr>
+
+```
+SELECT c1, c2
+FROM t1
+FULL OUTER JOIN t2 ON condition;
+```
+Perform full outer join
+<hr>
+
+```
+SELECT c1, c2
+FROM t1
+CROSS JOIN t2;
+```
+Produce a Cartesian product of rows in tables
+<hr>
+
+```
+SELECT c1, c2
+FROM t1, t2;
+```
+Another way to perform cross join
+<hr>
+
+```
+SELECT c1, c2
+FROM t1 A
+INNER JOIN t2 B ON condition;
+```
+Join t1 to itself using INNER JOIN clause
+
+</details>
+
+### 3️⃣ USING SQL OPERATORS
+<details>
+<summary>View Queries </summary>
+
+```
+SELECT c1, c2 
+FROM t1
+UNION [ALL]
+SELECT c1, c2 FROM t2;
+```
+Combine rows from two queries
+<hr>
+
+```
+SELECT c1, c2 FROM t1
+INTERSECT
+SELECT c1, c2 FROM t2;
+```
+Return the intersection of two queries
+<hr>
+
+```
+SELECT c1, c2 FROM t1
+EXCEPT 
+SELECT c1,c2 FROM t2;
+```
+Subtract a result set from another result set
+<hr>
+
+```
+SELECT c1, c2 FROM t
+WHERE c1[NOT] LIKE pattern;
+```
+Query rows using pattern matching %, _
+<hr>
+
+```
+SELECT c1, c2 FROM t
+WHERE c1[NOT] IN value_list;
+```
+Query rows in a list
+<hr>
+
+```
+SELECT c1, c2 FROM t
+WHERE c1 BETWEEN low_value AND high_value;
+```
+Query rows between two values
+<hr>
+
+```
+SELECT c1, c2 FROM t
+WHERE c1 IS [NOT]NULL;
+```
+Check if values in a table is NULL or not
+</details>
+
+### 4️⃣ MANAGING TABLES
+<details>
+<summary>View Queries</summary>
+
+```
+CREATE TABLE(
+    id SERIAL PRIMARY KEY,
+    name VARCHAR NOT NULL,
+    price NUMERIC(10,2) DEFAULT 0
+);
+```
+Create a new table with three columns
+<hr>
+
+```
+DROP TABLE t CASCADE;
+```
+Delete the table from the database
+<hr>
+
+```
+ALTER TABLE t ADD column;
+```
+Add a new column to the table
+<hr>
+
+```
+ALTER TABLE t DROP COLUMN c;
+```
+Drop column c from the table
+<hr>
+
+```
+ALTER TABLE t ADD contraint;
+```
+Add a constraint
+<hr>
+
+```
+ALTER TABLE t DROP constraint;
+```
+Drop a constraint
+<hr>
+
+```
+ALTER TABLE t1 RENAME TO t2;
+```
+Rename a table from t1 to t2
+<hr>
+
+```
+ALTER TABLE t1 RENAME c1 to c2;
+```
+Rename column c1 to c2
+<hr>
+
+```
+TRUNCATE TABLE t CASCADE;
+```
+Remove all data in a table
+</details>
+
+### 5️⃣ USING SQL CONSTRAINTS
+<details>
+<summary>View Queries</summary>
+
+```
+CREATE TABLE t(
+    c1 INT, c2 INT, c3 VARCHAR,
+    PRIMARY KEY(c1, c2)
+);
+```
+Set c1 and c2 as a primary key
+<hr>
+
+```
+CREATE TABLE t1(
+    c1 SERIAL PRIMARY KEY,
+    c2 INT,
+    FOREIGN KEY (c2) REFERENCES ts(c2)
+);
+```
+Set c2 column as a foreign key
+<hr>
+
+```
+CREATE TABLE t(
+    c1 INT, c1 INT,
+    UNIQUE(c2, c3)
+);
+```
+Make the values in c1 and c2 unique
+<hr>
+
+```
+CREATE TABLE t(
+    c1 INT, c INT,
+    CHECK(c1 > 0 AND c1 >= c2)
+);
+```
+Ensure c1 > 0 and values in c1 >= c2
+<hr>
+
+```
+CREATE TABLE t(
+    c1 SERIAL PRIMARY KEY,
+    c2 VARCHAR NOT NULL
+);
+```
+Set values in c2 column not null
+</details>
+
+### 6️⃣ MODIFIYING DATA
+<details>
+<summary>View Queries</summary>
+
+```
+INSERT INTO t(column_list)
+VALUES(value_list);
+```
+Insert one row into a table
+<hr>
+
+```
+INSERT INTO t(column_list)
+VALUES(value_list),
+        (value_list), ....;
+```
+Insert multiple rows into a table
+<hr>
+
+```
+INSERT INTO t1(column_list)
+SELECT column_list
+FROM t2;
+```
+Insert rows from t2 into t1
+<hr>
+
+```
+UPDATE t
+SET c1 = new_value;
+```
+Update new value in the column c1 for all rows
+<hr>
+
+```
+UPDATE t
+SET c1 = new_value,
+    c2 = new_value
+WHERE condition;
+```
+Update values in the column c1, c2 that match the condition
+<hr>
+
+```
+DELETE FROM t;
+```
+Delete all data in a table
+<hr>
+
+```
+DELETE FROM t 
+WHERE condition;
+```
+Delete subset of rows in a table
+</details>
+
+### 7️⃣ MANAGING VIEWS
+<details>
+<summary>View Queries</summary>
+
+```
+CREATE VIEW v(c1, c2)
+AS 
+SELECT c1, c2
+FROM t;
+```
+Create a new view that consists of c1 and c2
+<hr>
+
+```
+CREATE VIEW v(c1, c2)
+AS
+SELECT c1, c2
+FROM t
+WITH[CASCADED | LOCAL]CHECK OPTION;
+```
+Create a new view with check option
+<hr>
+
+```
+CREATE RECURSIVE VIEW v
+AS
+select-statement --anchor part
+UNION[ALL]
+select-statement; --recursive part
+```
+Create a recursive view
+<hr>
+
+```
+CREATE TEMPORARY VIEW v
+AS
+SELECT c1, c2
+FROM t;
+```
+Create a temporary view
+<hr>
+
+```
+DROP VIEW view_name;
+```
+Delete a view
+</details>
+
+
+### 8️⃣ MANAGING INDEXES
+<details>
+<summary>View Queries</summary>
+
+```
+CREATE INDEX inx_name
+ON t(c1, c2);
+```
+Create an index on c1 and c2 of the table t
+<hr>
+
+```
+CREATE UNIQUE INDEX inx_name
+ON t(c3, c4);
+```
+Create unique index on c3, c4 of the table t
+<hr>
+
+```
+DROP INDEX idx_name;
+```
+Drop an index
+</details>
+
+
+### 9️⃣ MANAGING TRIGGERS
+<details>
+<summary>View Queries</summary>
+
+```
+CREATE OR MODIFY TRIGGER trigger_name
+WHEN EVENT
+ON table_name TRIGGER_TYPE
+EXECUTE stored_procedure;
+```
+Create or modify a trigger
+<hr>
+
+```
+WHEN
+```
+- BEFORE - invoke before the event occurs
+- AFTER - invoke after the event occurs
+<hr>
+
+```
+EVENT
+```
+- INSERT - invoke for INSERT
+- UPDATE - invoke for UPDATE
+- DELETE - invoke for DELETE
+<hr>
+
+```
+TRIGGER_TYPE
+```
+- FOR EACH ROW
+- FOR EACH STATEMENT
+<hr>
+
+```
+CREATE TRIGGER before_insert_person
+BEFORE  INSERT
+ON person FOR EACH ROW
+EXECUTE stored_procedure;
+```
+Create a trigger invoked before a new row is inserted into the person table
+<hr>
+
+```
+DROP TRIGGER trigger_name
+```
+Delete a specific trigger
+</details>
+
+
+### 🔟 SQL AGGREGATE FUNCTIONS
+<details>
+<summary>View Queries</summary>
+
+- AVG - returns the average of a list
+- COUNT - returns the number of elements of a list
+- SUM - returns the total of a list
+- MAX - returns the maximum value in a list
+- MIN - returns the minimum value in a list
+</details>

languages/javascript.js

@@ -72,6 +72,7 @@ array.splice(start, deleteCount, item1, item2, ...)  // Adds and/or removes elem
 arr.unshift([element1[, ...[, elementN]]])           // Adds one or more elements to the front of an array and returns the new length of the array.
 
 // Instance: accessor methods
+arr.at(index)                                        // Returns the element at the specified index in the array.
 arr.concat(value1[, value2[, ...[, valueN]]])        // Returns a new array comprised of this array joined with other array(s) and/or value(s).
 arr.includes(searchElement, fromIndex)               // Determines whether an array contains a certain element, returning true or false as appropriate.
 arr.indexOf(searchElement[, fromIndex])              // Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found.

tools/firebase_cli.md

@@ -0,0 +1,140 @@
+# Firebase CLI Guide
+
+Firebase CLI (Command Line Interface) is a powerful tool that allows developers to interact with Firebase services and manage their Firebase projects directly from the command line. It provides a convenient and efficient way to deploy projects, manage databases, configure authentication, and more, streamlining the development and deployment processes.
+
+## Installation
+
+To use the Firebase CLI, you need to have Node.js and npm (Node Package Manager) installed on your system. Follow the steps below to install the Firebase CLI:
+
+1. Install Node.js and npm by downloading the installer from the [official Node.js website](https://nodejs.org/en/download/) and following the installation instructions for your operating system.
+
+2. Once Node.js and npm are installed, open your terminal or command prompt and run the following command to install the Firebase CLI globally:
+
+   ```
+   npm install -g firebase-tools
+   ```
+
+   This command will download and install the Firebase CLI package from the npm registry.
+
+3. After the installation is complete, you can verify that the Firebase CLI is installed correctly by running the following command:
+
+   ```
+   firebase --version
+   ```
+
+   If the installation was successful, you will see the version number of the Firebase CLI printed in the terminal.
+
+Congratulations! You have successfully installed the Firebase CLI.
+
+## Usage
+
+The Firebase CLI allows you to interact with Firebase services and manage your Firebase projects from the command line. Here are some common tasks you can perform using the Firebase CLI:
+
+- Initialize a new Firebase project in your current directory.
+- Deploy your Firebase project to Firebase hosting.
+- Manage Firebase Authentication, Realtime Database, Cloud Firestore, Cloud Functions, and other Firebase services.
+- Configure Firebase project settings.
+- Interact with Firebase emulators for local development and testing.
+
+To use the Firebase CLI, open your terminal or command prompt and run the `firebase` command followed by the desired command and options.
+
+Here's an example of the basic usage:
+
+```
+firebase <command> [options]
+```
+
+Replace `<command>` with the specific Firebase command you want to execute, and `[options]` with any additional options or flags required for that command.
+
+For more detailed usage information, you can run the following command:
+
+```
+firebase help
+```
+
+This command will display the available Firebase commands and provide detailed information about each command.
+
+## Commands
+
+Here are the commonly used Firebase CLI commands along with a brief explanation, syntax, and an example for each command:
+
+- `firebase init`: Initializes a new Firebase project in the current directory.
+
+  - Syntax: `firebase init [options]`
+  - Example: `firebase init hosting` initializes Firebase Hosting for the current project.
+
+- `firebase deploy`: Deploys your Firebase project to Firebase hosting or other Firebase services.
+
+  - Syntax: `firebase deploy [options]`
+  - Example: `firebase deploy --only hosting` deploys only the Firebase Hosting content.
+
+- `firebase serve`: Starts local development servers and Firebase emulators.
+
+  - Syntax: `firebase serve [options]`
+  - Example: `firebase serve --only functions,hosting` starts the Firebase emulators for functions and hosting.
+
+- `firebase login`: Authenticates the Firebase CLI with your Firebase account.
+
+  - Syntax: `firebase login [options]`
+  - Example: `firebase login --no-localhost` initiates an interactive login session without connecting to localhost.
+
+- `firebase logout`: Logs out from the Firebase CLI.
+
+  - Syntax: `firebase logout [options]`
+  - Example: `firebase logout` logs out the currently authenticated user.
+
+- `firebase use`: Sets the active Firebase project for the current directory.
+
+  - Syntax: `firebase use <project_id> [options]`
+  - Example: `firebase use my-project` sets "my-project" as the active Firebase project.
+
+- `firebase functions`: Interacts with Firebase Cloud Functions.
+
+  - Syntax: `firebase functions:command [options]`
+  - Example: `firebase functions:delete [function_name]` deletes all functions that match the specified name in all regions.
+
+- `firebase database`: Interacts with Firebase Realtime Database.
+
+  - Syntax: `firebase database:command [options]`
+  - Example: `firebase database:get /users` retrieves data from the Firebase Realtime Database.
+
+- `firebase firestore`: Interacts with Firebase Cloud Firestore.
+
+  - Syntax: `firebase firestore:command [options]`
+  - Example: `firebase firestore:delete collection/document` deletes a document from the Firestore database.
+
+- `firebase auth`: Interacts with Firebase Authentication.
+
+  - Syntax: `firebase auth:command [options]`
+  - Example: `firebase auth:export users.csv` exports user data to a CSV file.
+
+- `firebase hosting`: Interacts with Firebase Hosting.
+
+  - Syntax: `firebase hosting:command [options]`
+  - Example: `firebase hosting:disable` disables Firebase Hosting for the current project.
+
+- `firebase remoteconfig`: Interacts with Firebase Remote Config.
+
+  - Syntax: `firebase remoteconfig:command [options]`
+  - Example: `firebase remoteconfig:get template` retrieves the Remote Config template.
+
+- `firebase ext`: Interacts with Firebase Extensions.
+
+  - Syntax: `firebase ext:command [options]`
+  - Example: `firebase ext:install firebase/delete-user-data` installs the Firebase Extension named "firebase/delete-user-data".
+
+- `firebase appdistribution`: Interacts with Firebase App Distribution.
+
+  - Syntax: `firebase appdistribution:command [options]`
+  - Example: `firebase appdistribution:testers:add` Adds testers to the project.
+
+- `firebase use --add`: Adds an existing Firebase project to the current directory
+
+  - Syntax: `firebase use --add`
+  - Example: `firebase use --add` interactively adds an existing Firebase project.
+
+- `firebase projects:create`: Creates a new Firebase project.
+  - Syntax: `firebase projects:create [options]`
+  - Example: `firebase projects:create --display-name "My Project"` creates a new Firebase project with the given display name.
+
+These are just a few examples of the available commands. You can explore more commands and their options by running `firebase help` or visiting the [official Firebase CLI documentation](https://firebase.google.com/docs/cli).