Update js codes.docx

Author: priya42bagde

js codes.docx

@@ -2809,4 +2809,8 @@ ws.add(obj)
 console.log(ws.has(obj));
 WeakMap: It's similar to WeakSet where can't able to iterate and only stores an object
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+Hoisting : Its related to memory management.
+Global execution context having 2 component. In memory componenet variable and functions will store. Variable store with undefined and function store with prototype
+of function.
+