TypeScript bootcamp
Question on the left. Your TypeScript on the right. Check it.
Each lab is one problem: read the spec, write a solution, press Run, then Check. Hints stay closed. The correct code is there when you need it. tsc grades stdout against hidden tests.
50 labs · 29 easy · 21 medium · progress stays in this browser.
- Read the questionInput, output, and a short example. Same shape as a classroom worksheet.
- Write TypeScript, then RunThe starter is a skeleton. Change it, then see what happens.
- Check, or open a hintCheck runs every test. Hint and correct code stay folded until you open them.
Labs
Work them in order, or jump ahead when you are ready.
- 01easy
Hello, TypeScript
Output · 5 min
Open lab - 02easy
Sum two numbers
Types · 8 min
Open lab - 03easy
Even or odd
If Else · 8 min
Open lab - 04easy
Largest of three
If Else · 10 min
Open lab - 05easy
Times table
For · 10 min
Open lab - 06medium
Maximum in an array
Arrays · 12 min
Open lab - 07medium
Reverse a word
Strings · 10 min
Open lab - 08medium
Typed factorial
Functions · 12 min
Open lab - 09easy
Leap year
If Else · 10 min
Open lab - 10easy
Sum of digits
While · 10 min
Open lab - 11easy
Countdown
For · 8 min
Open lab - 12easy
Skip multiples of 3
Break Continue · 10 min
Open lab - 13medium
Is prime?
For · 12 min
Open lab - 14medium
GCD
While · 12 min
Open lab - 15easy
Star triangle
Nested Loops · 10 min
Open lab - 16easy
Keep the evens
Arrays · 10 min
Open lab - 17easy
Reverse the list
Arrays · 8 min
Open lab - 18easy
Min and max
Math · 8 min
Open lab - 19easy
Linear search
Arrays · 10 min
Open lab - 20medium
Set intersection
Sets · 12 min
Open lab - 21easy
Object lookup
Objects · 10 min
Open lab - 22medium
Power by recursion
Functions · 12 min
Open lab - 23medium
Collatz steps
While · 12 min
Open lab - 24easy
Days in a month
Switch · 10 min
Open lab - 25easy
Title case
Strings · 10 min
Open lab - 26medium
Sort by length
Arrow Functions · 12 min
Open lab - 27easy
Safe divide
Errors · 10 min
Open lab - 28easy
Absolute difference
Math · 8 min
Open lab - 29easy
Median of three
Arrays · 10 min
Open lab - 30medium
Power of two?
Operators · 10 min
Open lab - 31easy
Day name
Switch · 10 min
Open lab - 32easy
Count digits
Strings · 8 min
Open lab - 33medium
Zip sums
Array Methods · 12 min
Open lab - 34medium
Bubble sort
Arrays · 15 min
Open lab - 35medium
Matching brackets
Arrays · 15 min
Open lab - 36medium
Rectangle class
Classes · 12 min
Open lab - 37easy
Celsius to Fahrenheit
Numbers · 8 min
Open lab - 38easy
Letter grade
If Else · 10 min
Open lab - 39easy
Squares 1 to n
For · 8 min
Open lab - 40easy
Sum 1 to n
For · 8 min
Open lab - 41medium
FizzBuzz
For · 12 min
Open lab - 42medium
Fibonacci n
While · 12 min
Open lab - 43easy
Count words
Strings · 10 min
Open lab - 44easy
Count vowels
Strings · 10 min
Open lab - 45medium
Palindrome
Strings · 10 min
Open lab - 46medium
Anagram check
Strings · 12 min
Open lab - 47easy
Average
Arrays · 10 min
Open lab - 48medium
Second largest
Arrays · 12 min
Open lab - 49medium
Unique sorted
Sets · 10 min
Open lab - 50medium
Word frequency
Map · 12 min
Open lab