content restructured

02_Day/02_day_data_types.md

@@ -645,12 +645,16 @@ string.match(substring)
 
 ```js
 let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
-console.log(string.match('love')) //
+console.log(string.match('love'))
-/*
+```
-output
+
+```sh
+//output
 
 ["love", index: 2, input: "I love JavaScript. If you do not love JavaScript what else can you love.", groups: undefined]
-*/
+```
+
+```js
 let pattern = /love/gi
 console.log(string.match(pattern))   // ["love", "love", "love"]
 ```
@@ -658,10 +662,13 @@ console.log(string.match(pattern)) // ["love", "love", "love"]
 Let us extract numbers from text using regular expression. This is not regular expression section, no panic.
 
 ```js
-let txt = 'In 2019, I run 30 Days of Pyhton. Now, in 2020 I super exited to start this challenge'
+let txt = 'In 2019, I run 30 Days of Python. Now, in 2020 I super exited to start this challenge'
-let regEx = /\d+/ // d with escape character means d not a normal d instead acts a digit
+let regEx = /\d+/
+
+// d with escape character means d not a normal d instead acts a digit
 // + means one or more digit numbers,
 // if there is g after that it means global, search everywhere.
+
 console.log(txt.match(regEx))  // ["2", "0", "1", "9", "3", "0", "2", "0", "2", "0"]
 console.log(txt.match(/\d+/g)) // ["2019", "30", "2020"]
 ```
@@ -693,14 +700,16 @@ let lastName = 'Yetayeh' // string
 let country = 'Finland'         // string
 let city = 'Helsinki'           // string
 let age = 250                   // int, it is not my real age, do not worry about it
+let job
 
-console.log(typeof 'Asabeneh') // str
+console.log(typeof 'Asabeneh')  // string
-console.log(typeof firstName) // str
+console.log(typeof firstName)   // string
 console.log(typeof 10)          // number
 console.log(typeof 3.14)        // number
 console.log(typeof true)        // boolean
 console.log(typeof false)       // boolean
 console.log(typeof NaN)         // number
+console.log(typeof job)         // undefined
 console.log(typeof undefined)   // undefined
 console.log(typeof null)        // object
 ```
@@ -845,7 +854,7 @@ The quote 'There is no exercise better for the heart than reaching down and lift
   ```
 
 40. Check if typeof '10' is exactly equal to 10. If not make it exactly equal.
-20. Check if parseInt('9.8') is equal to 10 if not make it exactly equal with 10.
+41. Check if parseInt('9.8') is equal to 10 if not make it exactly equal with 10.
 
 🎉 CONGRATULATIONS ! 🎉