abstract equality comparison vs strict equality comparison

Author: isandeepdev

README.md

@@ -7,3 +7,5 @@ Primitive Types, Non-Primitive Types, `typeof` operatior, Special values like Na
 ## [Coercion](coercion/README.md)
 
 Abstract Operations: ToPrimitive, ToString, ToNumber and ToBoolean
+
+## [Abstract Equality Comparison vs Strict Equality Comparison](abstract-equality-vs-strict-equality/README.md)

abstract-equality-vs-strict-equality/README.md

@@ -0,0 +1,31 @@
+# Abstract Euality Comparison (==) vs Strict Equality Comparison (===)
+
+`==` and `===` both checks for type if the value's type matches both comparison is same, but if types does not matches `==` allows coercion while `===` does not.
+
+## Is coercion helpful in an equality comparison or not?
+
+The ESLint rule eqeqeq prevents the use of == (Abstract Equality Comparison). Whether this rule is helpful its a decision of your team. However, it’s important to understand when and how to use == effectively, as it can help you avoid unnecessary bugs caused by unexpected type coercion.
+
+## Abstract Equality Comparsion
+
+Abstract Equality Comparsion is same when the values type matches. If Type(x) is same as Type(y) then it return the result of performing **Strict Equality Comparison x===y**.
+
+- If x is null and y is undefined, return true.
+
+- If x is undefined and y is null, return true.
+
+If only if Type(x) and Type(y) does not matches, Abstract Equality Comparison allow coercion.
+
+- If Type(x) is Number and Type(y) is String, return the result of the comparison x == ToNumber(y).
+
+- If Type(x) is String and Type(y) is Number, return the result of the comparison ToNumber(x) == y.
+
+- If Type(x) is Boolean, return the result of the comparison ToNumber(x) == y.
+
+- If Type(y) is Boolean, return the result of the comparison x == ToNumber(y).
+
+- If Type(x) is either String or Number and Type(y) is Object, return the result of the comparison x == ToPrimitive(y).
+
+- If Type(x) is Object and Type(y) is either String or Number, return the result of the comparison ToPrimitive(x) == y.
+
+## Strict Equality Comparison