content restructured

02_Day/02_day_data_types.md

@@ -698,7 +698,11 @@ console.log(typeof 'Asabeneh') // str
 console.log(typeof firstName) // str
 console.log(typeof 10) // number
 console.log(typeof 3.14) // number
-console.log(typeof true) // bool
+console.log(typeof true) // boolean
+console.log(typeof false) // boolean
+console.log(typeof NaN) // number
+console.log(typeof undefined) // undefined
+console.log(typeof null)   // object
 ```
 
 ### Changing data type(Casting)

03_Day/03_booleans_operators_date.md

@@ -180,6 +180,19 @@ console.log(3 !== '3')    // true, compare both value and data type
 console.log(3 !== '3')          // true, compare both value and data type
 console.log(3 != 3)             // false, compare only value
 console.log(3 !== 3)            // false, compare both value and data type
+console.log(0 == false)         // true, equivalent
+console.log(0 == '')            // true, equivalent
+console.log(0 == ' ')           // true, equivalent
+console.log(0 === '')           // false, not exactly the same
+console.log(0 === false)        // false, not exactly the same
+console.log(1 == true)          // true, equivalent
+console.log(1 === true )        // false, not exactly the same
+console.log(undefined == null)  // true
+console.log(undefined === null) // true
+console.log(NaN == NaN)         // false, not equal
+console.log(NaN === NaN)        // false
+console.log(typeof NaN)         // number
+
 
 console.log('mango'.length == 'avocado'.length)  // false
 console.log('mango'.length != 'avocado'.length)  // true
@@ -190,6 +203,9 @@ console.log('tomato'.length == 'potato'.length)  // true
 console.log('python'.length > 'dragon'.length)   // false
 ```
 
+Try to understand the above comparisons with some logic. Remember without any logic might be difficult.
+JavaScript is some how a wired kind of programming language. JavaScript code run and give you a result but unless you are good at it may not be the desired result. The following [link](https://dorey.github.io/JavaScript-Equality-Table/) has an exhaustive list of comparison of data types.
+
 ### Logical Operators
 
 The following symbols are the common logical operators:
@@ -199,20 +215,26 @@ The following symbols are the common logical operators:
 ! negates true to false, false to true.
 
 ```js
-//&& ampersand example
-const check = 4 > 3 && 10 > 5; // true and true -> true
-const check = 4 > 3 && 10 < 5; // true and false -> false
-const check = 4 < 3 && 10 < 5; // false and false -> false
-//|| pipe or, example
-const check = 4 > 3 || 10 > 5; // true and true -> true
-const check = 4 > 3 || 10 < 5; // true and false -> true
-const check = 4 < 3 || 10 < 5; // false and false -> false
+
+//&& ampersand operator example
+
+const check = 4 > 3 && 10 > 5  // true and true -> true
+const check = 4 > 3 && 10 < 5  // true and false -> false
+const check = 4 < 3 && 10 < 5  // false and false -> false
+
+//|| pipe or operator, example
+
+const check = 4 > 3 || 10 > 5  // true and true -> true
+const check = 4 > 3 || 10 < 5  // true and false -> true
+const check = 4 < 3 || 10 < 5  // false and false -> false
+
 //! Negation examples
-let check = 4 > 3; // -> true
-let check = !(4 > 3); // -> false
-let isLightOn = true;
-let isLightOff = !isLightOn; // -> false
-let isMarried = !false; // -> true
+
+let check = 4 > 3            // true
+let check = !(4 > 3)         //  false
+let isLightOn = true
+let isLightOff = !isLightOn  // false
+let isMarried = !false       // true
 ```
 
 ### Increment Operator
@@ -266,12 +288,12 @@ Another way to write conditionals is using ternary operators. Look at the follow
 let isRaining = true
 isRaining
   ? console.log('You need a rain coat.')
-  : console.log('No need for a rain coat.');
+  : console.log('No need for a rain coat.')
 isRaining = false
 
 isRaining
   ? console.log('You need a rain coat.')
-  : console.log('No need for a rain coat.');
+  : console.log('No need for a rain coat.')
 ```
 
 ```sh
@@ -283,12 +305,12 @@ No need for a rain coat.
 let number = 5
 number > 0
   ? console.log(`${number} is a positive number`)
-  : console.log(`${number} is a number number`);
+  : console.log(`${number} is a number number`)
 number = -5
 
 number > 0
   ? console.log(`${number} is a positive number`)
-  : console.log(`${number} is a number number`);
+  : console.log(`${number} is a number number`)
 ```
 
 ```sh
@@ -554,7 +576,7 @@ Find the length of python and jargon and make a falsy comparison statement.
 
 ```js
 let firstName = 'Asabeneh'
-let lastName = 'Yetayeh
+let lastName = 'Yetayeh'
 ```
 
 ```sh