Use a loop to output a column of
numbers from `1`

to `100`

.

Use a loop to output a column of
numbers from `100`

to `1`

.

Use a loop to output a column of
even numbers from `1`

to `100`

.

Fill the array with `10`

x using a loop.

Fill the array with numbers from
`1`

to `10`

using a loop.

Given an array of numbers. Using the
loop, output only those elements of
the array that are greater than zero
and less than `10`

.

Given an array of numbers. Use a loop
to check that it has an element
with value `5`

.

Given an array of numbers. Use a loop to find the sum of the elements of this array.

Given an array of numbers. Use a loop to find the sum of the squares of the array elements.

Given an array of numbers. Find the arithmetic mean of its elements.

Write a script that will find the factorial of a number. Factorial is the product of all integers from one to a given number.

Fill the array with numbers from
`10`

to `1`

using a loop.

Given an array of numbers. Numbers can be positive or negative. Find the sum of positive array elements.

Given an array of numbers, for example:

`let arr = [10, 20, 30, 50, 235, 3000];`

Print only those numbers from the array
that start with `1`

, `2`

or `5`

.

Given an array of numbers. Print the elements of this array in reverse order.

Given an array of numbers. Use a loop to display all elements whose value matches their index number in the array.

Given an array of numbers. Using the loop
`for`

and the function `document.write`

print each element of the array in a new line.
Use the `br`

tag for this.

Given an array of numbers. Using the loop
`for`

and the function `document.write`

print each element of the array in
a separate paragraph.

Make an array of days of the week. Use the
loop `for`

to output all the days of
the week, and output the weekends in bold.

Make an array of `days of the week`

.
Use the loop `for`

to print all the
days of the week, and print the current
day in *italics*. The number of the
current day should be stored in
the variable `day`

.

Given the following object with employees and their salaries:

```
let obj = {
employee1: 100,
employee2: 200,
employee3: 300,
employee4: 400,
employee5: 500,
employee6: 600,
employee7: 700,
};
```

Increase the salary of each
employee by `10%`

.

Modify the previous task so that the
salary increases only for those employees
whose salary is less than or
equal to `400`

.

Given the following arrays:

```
let arr1 = [1, 2, 3, 4, 5];
let arr2 = [6, 7, 8, 9, 10];
```

Using these arrays, create a new object, making its keys from the elements of the first array and its values from the elements of the second.

Given the following object:

`let obj = {1: 6, 2: 7, 3: 8, 4: 9, 5: 10};`

Find the sum of the object keys and divide it by the sum of the object values.

Given the following object:

`let obj = {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5};`

Write the object keys to one array and the values to another.

Given the following object:

```
let obj = {
1: 125,
2: 225,
3: 128,
4: 356,
5: 145,
6: 281,
7: 452,
};
```

Write to the new array the elements whose
value starts with the number `1`

or
the number `2`

. That is, you will
end up with an array like this:

```
let arr = [
125,
225,
128,
145,
281,
];
```

Given the following array:

`let arr = ['a', 'b', 'c', 'd', 'e'];`

Create the following object from this array:

`let arr = {1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: 'e'};`

Given the following array:

`let arr = ['a', 'b', 'c', 'd', 'e'];`

Create the following object from this array:

`let arr = {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5};`