Asabeneh · superXdev · Nov 1, 2023 · Nov 7, 2023 · Nov 7, 2023 · Nov 7, 2023
diff --git a/Indonesia/02_Day_Data_types/02_day_data_types.md b/Indonesia/02_Day_Data_types/02_day_data_types.md
diff --git a/Indonesia/02_Day_Data_types/02_day_starter/index.html b/Indonesia/02_Day_Data_types/02_day_starter/index.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <title>30DaysOfJavaScript</title>
+</head>
+
+<body>
+        <h1>30DaysOfJavaScript:02 Day</h1>
+        <h2>Data types</h2>
+
+    <!-- import your scripts here -->
+    <script src="./main.js"></script>
+
+</body>
+
+</html>
diff --git a/Indonesia/02_Day_Data_types/02_day_starter/main.js b/Indonesia/02_Day_Data_types/02_day_starter/main.js
@@ -0,0 +1 @@
+// this is your main.js script
diff --git a/Indonesia/02_Day_Data_types/day_1_2.png b/Indonesia/02_Day_Data_types/day_1_2.png
diff --git a/Indonesia/02_Day_Data_types/math_object.js b/Indonesia/02_Day_Data_types/math_object.js
@@ -0,0 +1,34 @@
+const PI = Math.PI
+console.log(PI) // 3.141592653589793
+console.log(Math.round(PI)) // 3; to round values to the nearest number
+console.log(Math.round(9.81)) // 10
+console.log(Math.floor(PI)) // 3; rounding down
+console.log(Math.ceil(PI)) // 4; rounding up
+console.log(Math.min(-5, 3, 20, 4, 5, 10)) // -5, returns the minimum value
+console.log(Math.max(-5, 3, 20, 4, 5, 10)) // 20, returns the maximum value
+
+const randNum = Math.random() // creates random number between 0 to 0.999999
+console.log(randNum)
+// Let create random number between 0 to 10
+const num = Math.floor(Math.random() * 11) // creates random number between 0 and 10
+console.log(num)
+
+//Absolute value
+console.log(Math.abs(-10)) //10
+//Square root
+console.log(Math.sqrt(100)) // 10
+console.log(Math.sqrt(2)) //1.4142135623730951
+// Power
+console.log(Math.pow(3, 2)) // 9
+console.log(Math.E) // 2.718
+
+// Logarithm
+//Returns the natural logarithm of base E of x, Math.log(x)
+console.log(Math.log(2)) // 0.6931471805599453
+console.log(Math.log(10)) // 2.302585092994046
+
+// Trigonometry
+console.log(Math.sin(0))
+console.log(Math.sin(60))
+console.log(Math.cos(0))
+console.log(Math.cos(60))
diff --git a/Indonesia/02_Day_Data_types/non_primitive_data_types.js b/Indonesia/02_Day_Data_types/non_primitive_data_types.js
@@ -0,0 +1,30 @@
+let nums = [1, 2, 3]
+nums[0] = 10
+console.log(nums) // [10, 2, 3]
+
+let nums = [1, 2, 3]
+let numbers = [1, 2, 3]
+console.log(nums == numbers) // false
+
+let userOne = {
+  name: 'Asabeneh',
+  role: 'teaching',
+  country: 'Finland'
+}
+let userTwo = {
+  name: 'Asabeneh',
+  role: 'teaching',
+  country: 'Finland'
+}
+console.log(userOne == userTwo) // false
+
+let numbers = nums
+console.log(nums == numbers)  // true
+
+let userOne = {
+name:'Asabeneh',
+role:'teaching',
+country:'Finland'
+}
+let userTwo = userOne
+console.log(userOne == userTwo)  // true
diff --git a/Indonesia/02_Day_Data_types/number_data_types.js b/Indonesia/02_Day_Data_types/number_data_types.js
@@ -0,0 +1,9 @@
+let age = 35
+const gravity = 9.81 //we use const for non-changing values, gravitational constant in  m/s2
+let mass = 72 // mass in Kilogram
+const PI = 3.14 // pi a geometrical constant
+
+//More Examples
+const boilingPoint = 100 // temperature in oC, boiling point of water which is a constant
+const bodyTemp = 37 // oC average human body temperature, which is a constant
+console.log(age, gravity, mass, PI, boilingPoint, bodyTemp)
diff --git a/Indonesia/02_Day_Data_types/primitive_data_types.js b/Indonesia/02_Day_Data_types/primitive_data_types.js
@@ -0,0 +1,14 @@
+let word = 'JavaScript'
+// we dont' modify string 
+// we don't do like this, word[0] = 'Y' 
+let numOne = 3
+let numTwo = 3
+console.log(numOne == numTwo)      // true
+
+let js = 'JavaScript'
+let py = 'Python'
+console.log(js == py)             //false 
+
+let lightOn = true
+let lightOff = false
+console.log(lightOn == lightOff) // false
diff --git a/Indonesia/02_Day_Data_types/string_concatenation.js b/Indonesia/02_Day_Data_types/string_concatenation.js
@@ -0,0 +1,19 @@
+// Declaring different variables of different data types
+let space = ' '
+let firstName = 'Asabeneh'
+let lastName = 'Yetayeh'
+let country = 'Finland'
+let city = 'Helsinki'
+let language = 'JavaScript'
+let job = 'teacher'
+// Concatenating using addition operator
+let fullName = firstName + space + lastName // concatenation, merging two string together.
+console.log(fullName)
+
+let personInfoOne = fullName + '. I am ' + age + '. I live in ' + country // ES5
+console.log(personInfoOne)
+// Concatenation: Template Literals(Template Strings)
+let personInfoTwo = `I am ${fullName}. I am ${age}. I live in ${country}.` //ES6 - String interpolation method
+let personInfoThree = `I am ${fullName}. I live in ${city}, ${country}. I am a ${job}. I teach ${language}.`
+console.log(personInfoTwo)
+console.log(personInfoThree)
diff --git a/Indonesia/02_Day_Data_types/string_data_types.js b/Indonesia/02_Day_Data_types/string_data_types.js
@@ -0,0 +1,7 @@
+let space = ' ' // an empty space string
+let firstName = 'Asabeneh'
+let lastName = 'Yetayeh'
+let country = 'Finland'
+let city = 'Helsinki'
+let language = 'JavaScript'
+let job = 'teacher'
diff --git a/Indonesia/02_Day_Data_types/string_methods/accessing_character.js b/Indonesia/02_Day_Data_types/string_methods/accessing_character.js
@@ -0,0 +1,12 @@
+// Let us access the first character in 'JavaScript' string.
+
+let string = 'JavaScript'
+let firstLetter = string[0]
+console.log(firstLetter) // J
+let secondLetter = string[1] // a
+let thirdLetter = string[2]
+let lastLetter = string[9]
+console.log(lastLetter) // t
+let lastIndex = string.length - 1
+console.log(lastIndex) // 9
+console.log(string[lastIndex]) // t
diff --git a/Indonesia/02_Day_Data_types/string_methods/char_at.js b/Indonesia/02_Day_Data_types/string_methods/char_at.js
@@ -0,0 +1,6 @@
+// charAt(): Takes index and it returns the value at that index
+string.charAt(index)
+let string = '30 Days Of JavaScript'
+console.log(string.charAt(0)) // 3
+let lastIndex = string.length - 1
+console.log(string.charAt(lastIndex)) // t
diff --git a/Indonesia/02_Day_Data_types/string_methods/char_code_at.js b/Indonesia/02_Day_Data_types/string_methods/char_code_at.js
@@ -0,0 +1,7 @@
+// charCodeAt(): Takes index and it returns char code(ASCII number) of the value at that index
+
+string.charCodeAt(index)
+let string = '30 Days Of JavaScript'
+console.log(string.charCodeAt(3)) // D ASCII number is 51
+let lastIndex = string.length - 1
+console.log(string.charCodeAt(lastIndex)) // t ASCII is 116
diff --git a/Indonesia/02_Day_Data_types/string_methods/concat.js b/Indonesia/02_Day_Data_types/string_methods/concat.js
@@ -0,0 +1,6 @@
+// concat(): it takes many substrings and creates concatenation.
+// string.concat(substring, substring, substring)
+let string = '30'
+console.log(string.concat("Days", "Of", "JavaScript")) // 30DaysOfJavaScript
+let country = 'Fin'
+console.log(country.concat("land")) // Finland
diff --git a/Indonesia/02_Day_Data_types/string_methods/ends_with.js b/Indonesia/02_Day_Data_types/string_methods/ends_with.js
@@ -0,0 +1,11 @@
+// endsWith: it takes a substring as an argument and it checks if the string starts with that specified substring. It returns a boolean(true or false).
+// string.endsWith(substring)
+let string = 'Love is the best to in this world'
+console.log(string.endsWith('world')) // true
+console.log(string.endsWith('love')) // false
+console.log(string.endsWith('in this world')) // true
+
+let country = 'Finland'
+console.log(country.endsWith('land')) // true
+console.log(country.endsWith('fin')) // false
+console.log(country.endsWith('Fin')) //  false
diff --git a/Indonesia/02_Day_Data_types/string_methods/includes.js b/Indonesia/02_Day_Data_types/string_methods/includes.js
@@ -0,0 +1,14 @@
+// includes(): It takes a substring argument and it check if substring argument exists in the string. includes() returns a boolean. It checks if a substring exist in a string and it returns true if it exists and false if it doesn't exist.
+let string = '30 Days Of JavaScript'
+console.log(string.includes('Days'))     // true
+console.log(string.includes('days'))     // false
+console.log(string.includes('Script'))     // true
+console.log(string.includes('script'))     // false
+console.log(string.includes('java'))     // false
+console.log(string.includes('Java'))     // true
+
+let country = 'Finland'
+console.log(country.includes('fin')) // false
+console.log(country.includes('Fin')) // true
+console.log(country.includes('land')) // true
+console.log(country.includes('Land')) // false
diff --git a/Indonesia/02_Day_Data_types/string_methods/index_of.js b/Indonesia/02_Day_Data_types/string_methods/index_of.js
@@ -0,0 +1,11 @@
+// indexOf(): Takes takes a substring and if the substring exists in a string it returns the first position of the substring if does not exist it returns -1
+
+string.indexOf(substring)
+let string = '30 Days Of JavaScript'
+console.log(string.indexOf('D'))          // 3
+console.log(string.indexOf('Days'))       // 3
+console.log(string.indexOf('days'))       // -1
+console.log(string.indexOf('a'))          // 4
+console.log(string.indexOf('JavaScript')) // 11
+console.log(string.indexOf('Script'))     //15
+console.log(string.indexOf('script'))     // -1
diff --git a/Indonesia/02_Day_Data_types/string_methods/last_index_of.js b/Indonesia/02_Day_Data_types/string_methods/last_index_of.js
@@ -0,0 +1,6 @@
+// lastIndexOf(): Takes takes a substring and if the substring exists in a string it returns the last position of the substring if it does not exist it returns -1
+
+let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
+console.log(string.lastIndexOf('love'))       // 67
+console.log(string.lastIndexOf('you'))        // 63
+console.log(string.lastIndexOf('JavaScript')) // 38
diff --git a/Indonesia/02_Day_Data_types/string_methods/length.js b/Indonesia/02_Day_Data_types/string_methods/length.js
@@ -0,0 +1,6 @@
+// length: The string length method returns the number of characters in a string included empty space. Example:
+
+let js = 'JavaScript'
+console.log(js.length)        // 10
+let firstName = 'Asabeneh'
+console.log(firstName.length) // 8
diff --git a/Indonesia/02_Day_Data_types/string_methods/match.js b/Indonesia/02_Day_Data_types/string_methods/match.js
@@ -0,0 +1,22 @@
+// match: it takes a substring or regular expression pattern as an argument and it returns an array if there is match if not it returns null. Let us see how a regular expression pattern looks like. It starts with / sign and ends with / sign.
+let string = 'love'
+let patternOne = /love/ // with out any flag
+let patternTwo = /love/gi // g-means to search in the whole text, i - case insensitive
+string.match(substring)
+let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
+console.log(string.match('love')) //
+/*
+output
+
+["love", index: 2, input: "I love JavaScript. If you do not love JavaScript what else can you love.", groups: undefined]
+*/
+let pattern = /love/gi
+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.
+
+let txt = 'In 2019, I run 30 Days of Python. Now, in 2020 I super exited to start this challenge'
+let regEx = /\d/g // 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"]
diff --git a/Indonesia/02_Day_Data_types/string_methods/repeat.js b/Indonesia/02_Day_Data_types/string_methods/repeat.js
@@ -0,0 +1,4 @@
+// repeat(): it takes a number argument and it returned the repeated version of the string.
+// string.repeat(n)
+let string = 'love'
+console.log(string.repeat(10)) // lovelovelovelovelovelovelovelovelovelove
diff --git a/Indonesia/02_Day_Data_types/string_methods/replace.js b/Indonesia/02_Day_Data_types/string_methods/replace.js
@@ -0,0 +1,7 @@
+// replace(): takes to parameter the old substring and new substring.
+// string.replace(oldsubstring, newsubstring)
+
+let string = '30 Days Of JavaScript'
+console.log(string.replace('JavaScript', 'Python')) // 30 Days Of Python
+let country = 'Finland'
+console.log(country.replace('Fin', 'Noman')) // Nomanland
diff --git a/Indonesia/02_Day_Data_types/string_methods/search.js b/Indonesia/02_Day_Data_types/string_methods/search.js
@@ -0,0 +1,4 @@
+// search: it takes a substring as an argument and it returns the index of the first match.
+// string.search(substring)
+let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
+console.log(string.search('love')) // 2
diff --git a/Indonesia/02_Day_Data_types/string_methods/split.js b/Indonesia/02_Day_Data_types/string_methods/split.js
@@ -0,0 +1,10 @@
+// split(): The split method splits a string at a specified place.
+let string = '30 Days Of JavaScript'
+console.log(string.split())     // ["30 Days Of JavaScript"]
+console.log(string.split(' '))  // ["30", "Days", "Of", "JavaScript"]
+let firstName = 'Asabeneh'
+console.log(firstName.split())  // ["Asabeneh"]
+console.log(firstName.split(''))  // ["A", "s", "a", "b", "e", "n", "e", "h"]
+let countries = 'Finland, Sweden, Norway, Denmark, and Iceland'
+console.log(countries.split(',')) // ["Finland", " Sweden", " Norway", " Denmark", " and Iceland"]
+console.log(countries.split(', '))   //  ["Finland", "Sweden", "Norway", "Denmark", "and Iceland"]
diff --git a/Indonesia/02_Day_Data_types/string_methods/starts_with.js b/Indonesia/02_Day_Data_types/string_methods/starts_with.js
@@ -0,0 +1,11 @@
+// startsWith: it takes a substring as an argument and it checks if the string starts with that specified substring. It returns a boolean(true or false).
+// string.startsWith(substring)
+let string = 'Love is the best to in this world'
+console.log(string.startsWith('Love')) // true
+console.log(string.startsWith('love')) // false
+console.log(string.startsWith('world')) // false
+
+let country = 'Finland'
+console.log(country.startsWith('Fin')) // true
+console.log(country.startsWith('fin')) // false
+console.log(country.startsWith('land')) //  false
diff --git a/Indonesia/02_Day_Data_types/string_methods/substr.js b/Indonesia/02_Day_Data_types/string_methods/substr.js
@@ -0,0 +1,5 @@
+//substr(): It takes two arguments,the starting index and number of characters to slice.
+let string = 'JavaScript'
+console.log(string.substr(4,6))    // Script
+let country = 'Finland'
+console.log(country.substr(3, 4))   // land
diff --git a/Indonesia/02_Day_Data_types/string_methods/substring.js b/Indonesia/02_Day_Data_types/string_methods/substring.js
@@ -0,0 +1,9 @@
+// substring(): It takes two arguments,the starting index and the stopping index but it doesn't include the stopping index.
+let string = 'JavaScript'
+console.log(string.substring(0,4))   // Java
+console.log(string.substring(4,10))     // Script
+console.log(string.substring(4))    // Script
+let country = 'Finland'
+console.log(country.substring(0, 3))   // Fin
+console.log(country.substring(3, 7))   // land
+console.log(country.substring(3))   // land
diff --git a/Indonesia/02_Day_Data_types/string_methods/to_lowercase.js b/Indonesia/02_Day_Data_types/string_methods/to_lowercase.js
@@ -0,0 +1,7 @@
+// toLowerCase(): this method changes the string to lowercase letters.
+let string = 'JavasCript'
+console.log(string.toLowerCase())     // javascript
+let firstName = 'Asabeneh'
+console.log(firstName.toLowerCase())  // asabeneh
+let country = 'Finland'
+console.log(country.toLowerCase())   // finland
diff --git a/Indonesia/02_Day_Data_types/string_methods/to_uppercase.js b/Indonesia/02_Day_Data_types/string_methods/to_uppercase.js
@@ -0,0 +1,8 @@
+// toUpperCase(): this method changes the string to uppercase letters.
+
+let string = 'JavaScript'
+console.log(string.toUpperCase())      // JAVASCRIPT
+let firstName = 'Asabeneh'
+console.log(firstName.toUpperCase())  // ASABENEH
+let country = 'Finland'
+console.log(country.toUpperCase())    // FINLAND
diff --git a/Indonesia/02_Day_Data_types/string_methods/trim.js b/Indonesia/02_Day_Data_types/string_methods/trim.js
@@ -0,0 +1,7 @@
+//trim(): Removes trailing space in the beginning or the end of a string.
+let string = '   30 Days Of JavaScript   '
+console.log(string)     // 
+console.log(string.trim(' '))  // 
+let firstName = ' Asabeneh '
+console.log(firstName)
+console.log(firstName.trim())  //