Create Ep10.md

Author: HariAcidReign

Notes/Ep10.md

@@ -0,0 +1,25 @@
+# Episode 10 : Closures in JS
+### Important Interview Question
+
+**Closure :** Function bundled together with its lexical environment/scope. 
+
+```
+JS is a weird language. You can pass functions as parameters to another function, assign a variable to an entire function, or even return a function.
+eg:
+
+function x() {
+  var a = 7;
+  function y() {
+  console.log(a);
+}
+  return y;   // instead of y();
+}
+var z = x();
+console.log(z);  // value of z is entire code of function y.
+
+```
+
+When functions are returned from another fun, they still maintain their lexical scope. 
+- When y is returned, not only is the fun returned, but the entire closure (fun y + its lexical scope) is returned and put inside z. So when z is used 
+somewhere else in program, it still remembers var a inside x(). 
+