Finding errors in code with loops in JavaScript

Задание 1

The code should output numbers from 0 to 10:

javascriptfor (let i = 0; i > 10; i++) {
  console.log(i);
}

Задание 2

The code should output numbers from 10 to 0:

javascriptfor (let i = 10; i > 0; i++) {
  console.log(i);
}

Задание 3

The code should output numbers from 10 to 0:

javascriptfor (let i = 10; i == 0; i--) {
  console.log(i);
}

Задание 4

The code should output numbers from 0 to 10:

javascriptlet i = 0;

while (i >= 10) {
  console.log(i);
  i++;
}

Задание 5

The code should find the sum of integers from 1 to 10:

javascriptlet res;

for (let i = 1; i <= 10; i++) {
  res += i;
}

console.log(res);

Задание 6

The code should find the product of integers from 1 to 10:

javascriptlet res = 0;

for (let i = 1; i <= 10; i++) {
  res *= i;
}

console.log(res);

Задание 7

The code should find the sum of the array elements:

javascriptlet arr = ['1', '2', '3', '4', '5'];
let sum = 0;

for (let elem of arr) {
  sum += elem;
}

console.log(sum); // should output 15

Задание 8

The code should find the sum of the array elements:

javascriptlet arr = ['1', '2', '3', '4', '5'];
let sum = '';

for (let elem of arr) {
  sum += +elem;
}

console.log(sum); // should output 15

Задание 9

The code should find the sum of the array elements:

javascriptlet arr = ['1', '2', '3', '4', '5'];
let sum = 0;

for (let elem of arr) {
  sum = +elem;
}

console.log(sum); // should output 15

Задание 10

The code should find the sum of the array elements, however, it always outputs NaN:

javascriptlet arr = ['1', '2', '3', '4', '5'];
let sum = 0;

for (let i = 0; i <= arr.length; i++) {
  sum += +arr[i];
}

console.log(sum); // for some reason outputs NaN

Задание 11

The code should find the sum of the array elements:

javascriptlet arr = ['1', '2', '3', '4', '5'];
let sum = 0;

for (let i = 0; i < arr.length - 1; i++) {
  sum += +arr[i];
}

console.log(sum); // for some reason it doesn't output 15

Задание 12

The code should find the sum of the array elements:

javascriptlet arr = ['1', '2', '3', '4', '5'];
let sum = 0;

for (let i = 0; i < arr.length; i++) {
  sum += +i;
}

console.log(sum); // for some reason it doesn't output 15

Задание 13

The code should square each element of the array:

javascriptlet arr = [1, 2, 3, 4, 5];

for (let elem of arr) {
  elem = elem ** 2;
}

console.log(arr);

Задание 14

The code should fill the array with numbers from 1 to 5:

javascriptlet arr;

for (let i = 1; i <= 5; i++) {
  arr.push(i);
}

console.log(arr);

Задание 15

The code should find the sum of the elements of the object:

javascriptlet obj = {a: 1, b: 2, c: 3};
let sum = 0;

for (let elem in obj) {
  sum += elem;
}

console.log(sum);

Задание 16

The code should find the sum of the elements of the object:

javascriptlet obj = {a: 1, b: 2, c: 3};
let sum = 0;

for (let key in obj) {
  sum = +obj.key;
}

console.log(sum);

Задание 17

The code should check if the array contains the number 3 or not:

javascriptlet arr = [1, 2, 3, 4, 5];
let res = '';

for (let elem of arr) {
  if (elem === 3) {
    res = '+++';
  } else {
    res = '---';
  }
}

console.log(res);

Задание 18

The code should fill the array with numbers from 1 to 5:

javascriptfor (let i = 1; i <= 5; i++) {
  arr.push(i);
}

console.log(arr);

Задание 19

The code should check if the array contains the number 3 or not:

javascriptlet arr = [1, 2, 3, 4, 5];
let res = false;

for (let elem of arr) {
  if (elem === 3) {
    let res = true;
    break;
  }
}

console.log(res);

Задание 20

The code should output only even elements from the array:

javascriptlet arr = [1, 2, 3, 4, 5];

for (let elem of arr) {
  if (elem % 2 = 0) {
    console.log(elem);
  }
}

Задание 21

The code should write to the new array only the odd elements of the old array:

javascriptlet arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];

for (let elem of arr) {
  if (elem % 2 != 0) {
    res.push(elem);
  }
}

console.log(res);