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9 changes: 9 additions & 0 deletions 01/app.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
let users = [
'Jan Kowalski',
'Grzegorz Małolepszy',
'Adam Nieproszony',
'Katarzyna Nowak',
'Olga Zarzeczna',
];

console.log(users[0], users[2], users[4], users.length);
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👍

24 changes: 16 additions & 8 deletions 02/app.js
Original file line number Diff line number Diff line change
@@ -1,23 +1,31 @@
const randomArray = createRandomArray();
console.log(randomArray);

for (let i = 0; i <= randomArray.length - 1; i++) {
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Chyba łatwiej jest też zapisać bez = oraz -1 - mniej pisania, tj. for (let i = 0; i < randomArray.length; i++) {

console.log(randomArray[i]);
}

randomArray.forEach((num) => {
console.log(num);
});

console.log(randomArray[randomArray.length - 1]);

// nie modyfikuj kodu poniżej!

// funkcję może deklarować poniżej wywołania
// ponieważ w JS występuje mechanizm tzw. hoisting-u

function createRandomArray() {
const arr = [];
const len = getRandomInteger(1, 10)
for(let i=0; i<len; i++) {
arr.push( getRandomInteger(1, 100) );
}
const arr = [];
const len = getRandomInteger(1, 10);
for (let i = 0; i < len; i++) {
arr.push(getRandomInteger(1, 100));
}

return arr;
return arr;
}

function getRandomInteger(min, max) {
return Math.round(Math.random() * (max-min) + min);
}
return Math.round(Math.random() * (max - min) + min);
}
8 changes: 7 additions & 1 deletion 03/app.js
Original file line number Diff line number Diff line change
@@ -1,2 +1,8 @@
const n = 24;
const oddNumbers = [];
const oddNumbers = [];

for (let i = 1; i <= n; i += 2) {
oddNumbers.push(i);
}

console.log(oddNumbers);
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4 changes: 3 additions & 1 deletion 04/app.js
Original file line number Diff line number Diff line change
@@ -1 +1,3 @@
const years = [1980, 1934, 2002, 2019];
const years = [1980, 1934, 2002, 2019];
const currentYear = new Date().getFullYear();
const howLong = years.map((year) => currentYear - year);
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8 changes: 7 additions & 1 deletion 05/app.js
Original file line number Diff line number Diff line change
@@ -1 +1,7 @@
const numbers = [1, 2, 3, 4, 5, 6, 7];
const numbers = [1, 2, 3, 4, 5, 6, 7];

const sum = numbers
.filter((num) => num % 2 === 0)
.reduce((prev, curr) => curr + prev);
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Warto na końcu dać 2 parametr tj. , 0 - wtedy nie będzie błędu jak tablica będzie pusta.


console.log(sum);