Add Pure function Def

varit05 · web-flow · commit f12649b9af0c · 2018-12-28T15:28:37.000+05:30
diff --git a/README.md b/README.md
@@ -8,6 +8,7 @@ One place JavaScript!
 - [Callback/ Higher-order Function](#callback)
 - [Promises](#promises)
 - [Closures](#closures)
+- [Pure functions](#pure)
 - [Splice vs Slice vs Split](#diffs)
 - [Data Types](#datatypes)
 - [DOM](#dom)
@@ -118,6 +119,17 @@ function outerFunction () {
 outerFunction()() // I see the outer variable!
 ```
 
+
+<a name=“pure”/>
+
+#### Pure functions
+
+A Pure functions doesn't depend on and doesn't modify the states of the variable out of its scope. 
+Technically, that means a pure function always returns same results given same parameters.
+Its execution doesn't depends on the state of the system.
+Pure functions are the piller of the Functional Programming 
+
+
 <a name=“sdiff”/>
 
 #### Splice vs Slice vs Split
