diff --git a/01/assets/js/app.js b/01/assets/js/app.js
index 9323b98d..c10320e8 100644
--- a/01/assets/js/app.js
+++ b/01/assets/js/app.js
@@ -1,4 +1,61 @@
const a = '4.2';
const b = 9;
-console.log(a, b);
\ No newline at end of file
+console.log(a, b);
+
+console.log(typeof(a)); console.log(typeof(b))
+
+////operations
+const addition = a + b
+const subraction = a - b
+const multiplication = a * b
+const exponentiation = a**b
+const division = a / b
+
+function checkAddition(addition) {
+ const result = Boolean(addition === parseFloat(a) + parseFloat(b))
+ if(result) {
+ return addition
+ } else return parseFloat(a) + parseFloat(b)
+}
+
+function checkSubtraction(subtraction) {
+ const result = Boolean(subtraction === parseFloat(a) - parseFloat(b))
+ if(result) {
+ return subtraction
+ } else return parseFloat(a) - parseFloat(b)
+}
+function checkMultiplication(multiplication) {
+ const result = Boolean(multiplication === parseFloat(a) * parseFloat(b))
+ if(result) {
+ return multiplication
+ } else return parseFloat(a) * parseFloat(b)
+}
+function checkDivision(division) {
+ const result = Boolean(division === parseFloat(a) / parseFloat(b))
+ if(result) {
+ return division
+ } else return parseFloat(a) / parseFloat(b)
+}
+function checkExponation(exponentiation) {
+ const result = Boolean(exponentiation === parseFloat(a) ** parseFloat(b))
+ if(result) {
+ return exponentiation
+ } else return parseFloat(a) ** parseFloat(b)
+}
+
+function isBiggerthan20(result) {
+ if(result > 20) {
+ console.log('the result is bigger than 20')
+ } else console.log('the result is smaller than 20')
+}
+
+const allResults = [addition, subraction, multiplication, exponentiation, division]
+allResults.forEach(function(result) {
+ isBiggerthan20(result)
+})
+
+
+
+
+
diff --git a/01/index.html b/01/index.html
index 5c55d687..383b56a2 100644
--- a/01/index.html
+++ b/01/index.html
@@ -4,6 +4,7 @@
+
devmentor.pl - JS BASICS - #01
diff --git a/02/app.js b/02/app.js
index b397190c..11df45cb 100644
--- a/02/app.js
+++ b/02/app.js
@@ -1,7 +1,34 @@
/* rozwiązanie z pętlą for */
-const x = 4;
+const x = prompt("Podaj liczbę!")
+for(let i = 1; i < 10; i++) {
+ console.log(x + '*' + i + '=' + x * i)
+}
+/* rozwiązanie z pętlą while */
-/* rozwiązanie z pętlą while */
\ No newline at end of file
+function exponentiation() {
+ const a = parseFloat(prompt('podaj podstawę potęgi!'))
+ const n = parseFloat(prompt('podaj wykładnik potęgi!'))
+
+ if(isNaN(a) || isNaN(n)) {
+ console.log('wrong input format')
+ return;
+ }
+ let counter = 1
+ let output = ''
+ while(counter <= n) {
+ if(counter == 1) {
+ output += a
+ } else if(counter > 1 && counter !== n){
+ output += '*' + a
+ } else {
+ output += '*' + a + '=' + a**n
+ }
+ counter++
+ }
+ console.log(output)
+}
+
+exponentiation()
\ No newline at end of file
diff --git a/02/index.html b/02/index.html
index 30150099..387d91c6 100644
--- a/02/index.html
+++ b/02/index.html
@@ -4,6 +4,7 @@
+
devmentor.pl - JS BASICS - #02
diff --git a/03/app.js b/03/app.js
index 5b9361e4..31a29899 100644
--- a/03/app.js
+++ b/03/app.js
@@ -7,10 +7,43 @@ const c = randomNumber(min, max);
console.log(a, b, c);
-
-
-
-
+function getSum(num1, num2, num3) {
+ num1Int = parseInt(num1)
+ num2Int = parseInt(num2)
+ num3Int = parseInt(num3)
+
+ const numbers = [num1Int, num2Int, num3Int]
+ numbers.sort((a,b) => b - a)
+ const sum = numbers[0] + numbers[1]
+ return sum
+}
+
+const isEven = (num) => {
+ if(isNaN(num)){
+ return null
+ } else {
+ if(num % 2 === 0) {
+ return true
+ } else return false
+ }
+}
+
+function showInfo(sum,value) {
+ switch(value) {
+ case null:
+ console.log(`Podany argument ${sum} nie jest liczbą`)
+ break
+ case true:
+ console.log(`Podany argument ${sum} jest parzysty`)
+ break
+ case false:
+ console.log(`Podany argument ${sum} jest nieparzysty`)
+ }
+}
+
+const sum = getSum(a,b, c)
+const even = isEven(sum)
+showInfo(sum, even)
function randomNumber(min, max) {
diff --git a/04/app.js b/04/app.js
new file mode 100644
index 00000000..c8778579
--- /dev/null
+++ b/04/app.js
@@ -0,0 +1,23 @@
+function createArray(min, max) {
+ const array = []
+ for(let i = 0; i < 20; i++) {
+ const number = Math.round(Math.random() * (max - min) + min)
+ array.push(number)
+ }
+ return array
+}
+
+function sortArray(array) {
+ array.sort((a,b) => b - a)
+ return array.slice(0,10)
+}
+
+function arithmeticAvarage(array){
+ const arrayLength = array.length
+ const sum = array.reduce((acc, curr) => acc + curr)
+ const avarage = sum / arrayLength
+ return avarage
+}
+
+const RandomArray = createArray(10,200)
+console.log(arithmeticAvarage(sortArray(RandomArray)))
diff --git a/04/index.html b/04/index.html
index 06aebbb8..6a75dc77 100644
--- a/04/index.html
+++ b/04/index.html
@@ -4,6 +4,7 @@
+
devmentor.pl - JS BASICS - #04
diff --git a/05/app.js b/05/app.js
new file mode 100644
index 00000000..c3ab837e
--- /dev/null
+++ b/05/app.js
@@ -0,0 +1,43 @@
+function Student(initFirstName, initLastName) {
+ this.firstName = initFirstName
+ thislastName = initLastName
+ this.grades = {}
+}
+
+Student.prototype.addGrade = function(subject, grade) {
+ if(typeof this.grades[subject] === 'undefined') {
+ this.grades[subject] = []
+ }
+ this.grades[subject].push(grade)
+}
+
+Student.prototype.getAvarageGrade = function(subject) {
+ if(subject !== undefined) {
+ const gradesNumber = this.grades[subject].length
+ const sum = this.grades[subject].reduce((acc, curr) => acc + curr)
+ const avarage = sum / gradesNumber
+ return avarage
+ } else {
+ let totalGrades = 0;
+ let totalSum = 0;
+ for(subj in this.grades) {
+ const grades = this.grades[subj].length
+ const sum = this.grades[subj].reduce((acc, curr) => acc + curr)
+ totalSum += sum;
+ totalGrades += grades
+ }
+ const overallAvarage = totalSum / totalGrades;
+ return overallAvarage;
+ }
+}
+
+
+const Student1 = new Student("Ala", "Sobota")
+Student1.addGrade('math', 5)
+Student1.addGrade('math', 5)
+Student1.addGrade('math', 4)
+Student1.addGrade('english', 4)
+Student1.addGrade('biology', 3)
+console.log(Student1.getAvarageGrade())
+console.log(Student1)
+
diff --git a/05/index.html b/05/index.html
index 52a42709..3da4921e 100644
--- a/05/index.html
+++ b/05/index.html
@@ -4,6 +4,7 @@
+
devmentor.pl - JS BASICS - #05