Merge pull request #328 from biswajitdas-007/javascript

String methods added

README.md

@@ -95,10 +95,6 @@ Feel free to take a look. You might learn new things. They have been designed to
 - [Redis](databases/redis.sh)
   </details>
 
-#### PostgreSQL
-
-- [PostgreSQL](databases/postgresql.sh)
-
 ### 🔧 Tools
 
 <details>

databases/postgresql.sh

@@ -1,16 +0,0 @@
-# *****************************************************************************
-# BASICS
-# *****************************************************************************
-
-sudo -u postgres psql # PSQL command line interface in full admin mode
-
-# Anything inside the angular brackets <> will be your variables
-
-sudo -u postgres createuser <username> # Create user
-sudo -u postgres createdb <dbname> # Create database
-
-# Setting a password for a user
-sudo -u postgres psql
-alter user <username> with encrypted password '<password>';
-
-grant all privileges on database <dbname> to <username>; # grant privileges on a database to a user

languages/javascript.js

@@ -95,3 +95,9 @@ arr.reduce(callback[, initialValue])                 // Apply a function against
 arr.reduceRight(callback[, initialValue])            // Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value.
 arr.some(callback[, initialValue])                   // Returns true if at least one element in this array satisfies the provided testing function.
 arr.values()                                         // Returns a new Array Iterator object that contains the values for each index in the array.
+
+// String methods
+String.charAt(index)                                 // Returns the character at the specified index in a string.
+String.indexOf(character)                            // Returns the index of the first occurrence of a specified value in a string.
+String.substring(starting_index, ending_index)       // Returns a new string that is a subset of the original string.
+String.substring(starting_index)                     // Returns a substring from starting index to last index of string.

tools/ubuntu.sh

@@ -21,6 +21,7 @@ cat /proc/<process_id>/maps   # Show the current virtual memory usage of a Linux
 ip r # Display ip of the server
 
 lsof -i :9000 # List process running on port 9000
+kill -9 $(lsof -t -i:PORT) # Kill the process running on whichever port specified
 
 journalctl -u minio.service -n 100 --no-pager # List last 100 logs for specific service