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practice-js-basics done #166

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6972bb1
Task 01 done
satoshi300 Jun 15, 2025
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satoshi300 Jun 19, 2025
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satoshi300 Jun 19, 2025
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satoshi300 Jun 22, 2025
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satoshi300 Jul 3, 2025
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80 changes: 78 additions & 2 deletions 01/assets/js/app.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,80 @@
const a = '4.2';
const b = 9;
const b = 20;
const c = parseFloat(a);

console.log(a, b);
console.log(typeof a);
console.log(typeof b);

const addVariable = c + b;
console.log(addVariable);

const concatVariable = a + b;
console.log(concatVariable);

const subtractVariable = a - b;
console.log(subtractVariable);

const multiVariable = a * b;
console.log(multiVariable);

const divideVariable = a / b;
console.log(divideVariable);

const modVariable = Number(a) % b;
console.log(modVariable);

let incrementVar = a;
incrementVar++;
console.log(incrementVar);

let decrementVar = b;
decrementVar--;
console.log(decrementVar);


if (addVariable > 20) {
console.log('a+b jest wieksze od 20')
} else {
console.log('a+b jest mniejsze od 20')
}

if (subtractVariable > 20) {
console.log('a-b jest wieksze od 20')
} else {
console.log('a-b jest mniejsze od 20')
}

if (multiVariable > 20) {
console.log('a*b jest wieksze od 20')
} else {
console.log('a*b jest mniejsze od 20')
}

if (divideVariable > 20) {
console.log('a/b jest wieksze od 20')
} else {
console.log('a/b jest mniejsze od 20')
}

if (modVariable > 20) {
console.log('a%b jest wieksze od 20')
} else {
console.log('a%b jest mniejsze od 20')
}

if (incrementVar > 20) {
console.log('a++ jest wieksze od 20')
} else {
console.log('a++ jest mniejsze od 20')
}

if (decrementVar > 20) {
console.log('a-- jest wieksze od 20')
} else {
console.log('a-- jest mniejsze od 20')
}

console.log();
console.log();
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@devmentor-pl devmentor-pl Jun 23, 2025

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👍


console.log(a, b);
2 changes: 1 addition & 1 deletion 01/index.html
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Expand Up @@ -7,6 +7,6 @@
<title>devmentor.pl - JS BASICS - #01</title>
</head>
<body>

,<script src="./assets/js/app.js"></script>
</body>
</html>
39 changes: 37 additions & 2 deletions 02/app.js
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@@ -1,7 +1,42 @@

/* rozwiązanie z pętlą for */
const x = 4;
const x = prompt('Podaj liczbe z przedzialu od 1 do 9!');
let result;

for (let i = 1; i <= 9; i++) {
if (x <= 9 && x > 0) {
result = i * x;
console.log(x + ' x ' + i + ' = ' + result);
} else {

alert('Wybrana liczba nie jest z przedzialu 1-9');

}
}

/* rozwiązanie z pętlą while */

const a = parseInt(prompt('Podaj liczbe z przedzialu od 1 do 9'));
const n = parseInt(prompt('Podaj liczbe z przedzialu od 1 do 9'));
let result2 = 1
// console.log(result)


let j = 0;
let str = '';
if (a <= 9 && a > 0 && n <= 9 && n > 0) {
while (j < n) {
j++;
if (n === j) {
str += a;
} else {
str += a + '*';
}
}
console.log(str + '=' + Math.pow(a, n));
}
else {
alert('Wybrana liczba nie jest z przedzialu 1-9');
}


/* rozwiązanie z pętlą while */
4 changes: 2 additions & 2 deletions 02/index.html
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Expand Up @@ -7,6 +7,6 @@
<title>devmentor.pl - JS BASICS - #02</title>
</head>
<body>

</body>
<script src='./app.js'></script>
</body>
</html>
66 changes: 48 additions & 18 deletions 03/app.js
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@@ -1,18 +1,48 @@
const min = 1;
const max = 100;

const a = randomNumber(min, max);
const b = randomNumber(min, max);
const c = randomNumber(min, max);

console.log(a, b, c);







function randomNumber(min, max) {
return Math.round((Math.random() * (max - min)) + min);
}
const a = 41.5234;
const b = 25;
const c = 14;

const sum = getSum(a, b, c);


function getSum(a, b, c) {
let largestNum = Math.max(a, b, c);
let secondLargestNum;

if (largestNum === a) {
secondLargestNum = Math.max(b, c);
} else if (largestNum === b) {
secondLargestNum = Math.max(a, c);
} else {
secondLargestNum = Math.max(a, b);
}
return sum1 = parseInt(largestNum) + parseInt(secondLargestNum);
}

const even = isEven(2);

function isEven(num) {
if (typeof num !== "number") {
return null;
} else if (num % 2 === 0) {
return true;
} else {
return false;
}
}

function showInfo(para1, para2) {
switch (para2) {
case null:
console.log('Podany argument ' + para1 + ' nie jest liczbą');
break;
case true:
console.log('Podany argument ' + para1 + ' jest parzystybą');
break;
case false:
console.log('Podany argument ' + para1 + ' jest nieparzysty');
break;
}
}

showInfo(sum, even);
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@devmentor-pl devmentor-pl Jun 23, 2025

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👍

43 changes: 43 additions & 0 deletions 04/app.js
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@@ -0,0 +1,43 @@
function createArray(min, max) {
const arr = [];
for (let i = 1; i <= 20; i++) {
const randomNumber = Math.floor(Math.random() * (max - min + 1)) + min;
arr.push(randomNumber);
}
return arr;
}

const arr = createArray(10, 200);
console.log(arr);



function getLargest() {
arr.sort(function (a, b) {
return b - a;
});
return arr.slice(0, 10);

}
const largest = getLargest(arr);
console.log(largest);



function getAvg(arr) {
if (arr.length === 0) {
return 0;
}
let sum = 0;
arr.forEach(num => {
sum += num;
});
return sum / arr.length;
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@devmentor-pl devmentor-pl Jun 23, 2025

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Warto się zabezpieczyć czy nie dzielimy przez 0 :)


}

const avg = getAvg(largest);
console.log(avg);



15 changes: 12 additions & 3 deletions 04/index.html
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@@ -1,12 +1,21 @@
<!DOCTYPE html>
<html lang="pl">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<meta
name="viewport"
content="width=device-width, initial-scale=1.0"
>
<meta
http-equiv="X-UA-Compatible"
content="ie=edge"
>
<title>devmentor.pl - JS BASICS - #04</title>
</head>

<body>

<script src="./app.js"></script>
</body>

</html>
74 changes: 74 additions & 0 deletions 05/app.js
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@@ -0,0 +1,74 @@
// Tym razem stworzysz konstruktor, na podstawie którego będzie można generować obiekt przechowujący informacje o studencie.

// Wymagania:
// 1. Obiekt posiada imię i nazwisko przekazywane podczas inicjalizacji (przy użyciu `new`).

function Student(initFirstName, initLastName) {
this.firstName = initFirstName;
this.lastName = initLastName;
this.grades = {};
}


Student.prototype.addGrade = function (subject, grade) {
if (typeof this.grades[subject] === 'undefined') {
this.grades[subject] = [];
}
this.grades[subject].push(grade);
};

// 2. Konstruktor:
// - udostępnia metody (przez `prototype`),
// - metody te pozwalają:
// - dodać ocenę z danego przedmiotu,
// - obliczyć średnią arytmetyczną z konkretnego przedmiotu,
// - obliczyć ogólną średnią arytmetyczną.

Student.prototype.getAverageGrade = function (subject) {
if (typeof subject !== 'undefined') {
const grades = this.grades[subject];
if (!grades || grades.length === 0) return null;
console.log(grades);
let sum = 0;
for (let i = 0; i < grades.length; i++) {
sum += grades[i];
}
return (sum / grades.length);
}

let totalSum = 0;
let totalCount = 0;
console.log(this.grades);
for (let subjectName in this.grades) {
const subjectGrades = this.grades[subjectName];
console.log(subjectGrades);
for (let i = 0; i < subjectGrades.length; i++) {
totalSum += subjectGrades[i];
totalCount++;
}
}
if (totalCount === 0) return null;

return ((totalSum / totalCount).toFixed(2));
}

const maths = 4;

const student = new Student('Jan', 'Kowalski');
console.log(student)
student.addGrade('maths', 4);
student.addGrade('maths', 6);
student.addGrade('english', 3);
const avgMath = student.getAverageGrade('maths'); // 5
const avg = student.getAverageGrade(); // 4.33

console.log(avgMath);
console.log(avg)


// Zwróć uwagę, że pobranie informacji o ocenach z konkretnego przedmiotu może się odbywać w ten sposób:
// ```
// const subject = 'maths';
// const grades = this.grades[subject];
// ```

15 changes: 12 additions & 3 deletions 05/index.html
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@@ -1,12 +1,21 @@
<!DOCTYPE html>
<html lang="pl">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<meta
name="viewport"
content="width=device-width, initial-scale=1.0"
>
<meta
http-equiv="X-UA-Compatible"
content="ie=edge"
>
<title>devmentor.pl - JS BASICS - #05</title>
</head>

<body>

<script src='./app.js'></script>
</body>

</html>