The fundamental defination and it's example has been added

javascript.md

@@ -349,3 +349,22 @@ throw "Error message";    // throw error text to user
 |g|	Performs a global match and finds all|
 |i|	Performs case-insensitive matching|
 |m|	Performs multiline matching|
+
+## Closures
+
+A closure is the combination of a function bundled together (enclosed) with references
+ to its surrounding state (the lexical environment). In other words, a closure gives you 
+access to an outer function's scope from an inner function. In JavaScript, closures are 
+created every time a function is created, at function creation time.
+
+### Example
+```c
+function makeFunc() {
+  const name = 'Mozilla';
+  function displayName() {
+    console.log(name);
+  }
+  return displayName;
+}
+const myFunc = makeFunc();
+myFunc();

linux.md

@@ -42,3 +42,10 @@ tar -zcvf foo.txt.tar.gz foo.txt
 tar -xvf foo.txt.tar.gz
 
 ```
+## Text Editor Options for Programmers
+
+```c
+Sublime Text     Atom        GNU Emacs 
+Vim              Gedit       Notepadqq
+Nano             VsCode      Brackets
+```