Create a Binary Tree Manually in DSA Typescript - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new node with value 10.

DSA Typescript

const root = new TreeNode([1]);

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

A10

B'10'

Cnull

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers creates a string, not a number.

Using null or undefined will not create a valid node value.

The TreeNode constructor expects a number value. Using 10 correctly creates the root node.

2fill in blank

medium

Complete the code to assign a left child node with value 5 to the root.

DSA Typescript

root.left = new TreeNode([1]);

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

Anull

B'5'

C5

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of numbers for node values.

Assigning null or undefined instead of a new TreeNode.

Assigning a new TreeNode with value 5 as the left child correctly builds the left subtree.

3fill in blank

hard

Fix the error in the code to assign a right child node with value 15 to the root.

DSA Typescript

root.right = new TreeNode([1]);

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

A'15'

Bundefined

Cnull

D15

Attempts:

3 left

💡 Hint

Common Mistakes

Using string '15' instead of number 15.

Assigning null or undefined instead of a TreeNode.

The value must be a number, so 15 without quotes is correct.

4fill in blank

hard

Fill both blanks to create a left child with value 3 and a right child with value 7 for the left node.

DSA Typescript

root.left.left = new TreeNode([1]);
root.left.right = new TreeNode([2]);

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

A3

B7

Cnull

Dundefined

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the values or using null/undefined.

Using strings instead of numbers.

Assigning 3 and 7 as left and right children of root.left builds the subtree correctly.

5fill in blank

hard

Fill all three blanks to first create the right child of the root with value 15, then create its left child with value 17 and right child with value 25.

DSA Typescript

root.right = new TreeNode([3]);
root.right.left = new TreeNode([1]);
root.right.right = new TreeNode([2]);

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

A17

B25

C15

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning children before creating the parent node.

Using null instead of numbers for node values.

First, root.right is assigned 15, then its left and right children are assigned 17 and 25 respectively.