Loop execution flow in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 0 to 4 using a for loop.

Javascript

for (let i = 0; i [1] 5; i++) {
  console.log(i);
}

Drag options to blanks, or click blank then click option'

A<=

B>=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= 5 will print 0 to 5, which is one extra number.

Using > or >= will not run the loop as expected.

The loop should run while i is less than 5 to print numbers 0 to 4.

2fill in blank

medium

Complete the code to sum numbers from 1 to 5 using a for loop.

Javascript

let sum = 0;
for (let num = 1; num [1] 5; num++) {
  sum += num;
}
console.log(sum);

Drag options to blanks, or click blank then click option'

A>=

B<

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using < 5 will exclude 5 from the sum.

Using > or >= will not run the loop correctly.

The loop should include 5, so use num <= 5 to sum 1 through 5.

3fill in blank

hard

Fix the error in the loop condition to print even numbers from 2 to 10.

Javascript

for (let i = 2; i [1] 10; i += 2) {
  console.log(i);
}

Drag options to blanks, or click blank then click option'

A>

B<=

C<

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < 10 excludes 10 from the output.

Using > or >= will cause the loop not to run.

The loop should run while i is less than or equal to 10 to include 10.

4fill in blank

hard

Fill both blanks to create an object with numbers as keys and their squares as values for numbers 1 to 4.

Javascript

const squares = {};
for (let n = 1; n <= 4; n++) {
  squares[[1]] = [2];
}

Drag options to blanks, or click blank then click option'

An

Bn * n

Cn ** 2

Dn + n

Attempts:

3 left

💡 Hint

Common Mistakes

Using n + n gives double the number, not square.

Using n * n is correct but not the expected answer here.

The keys should be the number n, and the values should be the square using n ** 2.

5fill in blank

hard

Fill all three blanks to create an object with uppercase keys and values greater than 2 from the data object.

Javascript

const filtered = {};
for (const [key, value] of Object.entries(data)) {
  if (value [3] 2) {
    filtered[[1]] = [2];
  }
}

Drag options to blanks, or click blank then click option'

Akey.toUpperCase()

Bvalue

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= includes values less than or equal to 2, which is wrong.

Not converting keys to uppercase.

Keys are uppercase using key.toUpperCase(), values are value, and condition checks if value > 2.