gwecode

courses / typescript / level 1

level 1 · easy

typescript for
beginners.

From zero to your first real programs, with a friendly checker that catches mistakes before your code runs.

  • 28 lessons
  • 7 units
  • 3 h 31 m in all
  • £0, for good
start level 1

what’s inside.

For people who have never written a line of code. Nothing is assumed: every new word is explained the moment it appears.

TypeScript Level 1 assumes nothing, not even JavaScript. In 28 short lessons you go from what code is to writing your own typed functions, with a guess, a hands-on task and a fix-the-bug challenge in every lesson. It ends with a level check: a tiny quiz game that reads real answers.

every lesson goes the same way.

  1. meet it
  2. guess first
  3. your turn
  4. fix it
  5. nailed it

unit 1

Say hello

Make the computer do exactly what you tell it.

4 lessons · 26 min

  1. What code really is5 minFind out what code is and run your very first program.
  2. Your first line6 minMake the computer show any message you like.
  3. Showing more than once7 minShow several lines, blank lines and lots of words at once.
  4. When it goes wrong8 minRead error messages and fix the ones you will see most.

unit 2

Boxes with names

Make the computer remember things.

4 lessons · 29 min

  1. A variable is a labelled box8 minStore a value in a box, label what kind it is and get it back.
  2. Boxes can change7 minSwap what is in a box, lock a box and join strings.
  3. Good names, bad names6 minChoose names that TypeScript accepts and people understand.
  4. Asking a question8 minAsk the person a question and use their answer, even if there is none.

unit 3

Words and numbers

Tell text and numbers apart and use both.

4 lessons · 31 min

  1. Text vs numbers7 minSpot the difference between a string and a number.
  2. Doing maths7 minAdd, take away, multiply and divide like a pocket calculator.
  3. Tricks with text8 minShout, whisper, tidy and measure your strings.
  4. Putting values inside text9 minDrop values into sentences and turn typed text into numbers.

unit 4

Make decisions

Make your program choose what to do.

4 lessons · 31 min

  1. If this, do that8 minMake your program do something only when it should.
  2. Otherwise…7 minGive your program a plan B for when the answer is no.
  3. More than two choices8 minCheck one thing after another and pick the right path.
  4. And, or, not8 minLink conditions together to ask smarter questions.

unit 5

Repeat yourself

Do the same thing many times without copying.

4 lessons · 31 min

  1. Counting with for8 minRepeat lines as many times as you like with a for loop.
  2. Repeating with while8 minKeep a loop going until its condition turns false.
  3. Loops that decide8 minCheck every number in a loop and act on the ones that match.
  4. Stopping early7 minJump out of a loop, or skip a turn, when you need to.

unit 6

Arrays

Keep many things together and work through them.

4 lessons · 31 min

  1. Making an array7 minKeep lots of values together in one labelled box.
  2. Reading and changing items8 minPick out, swap and add items by their place in an array.
  3. Looping over an array8 minVisit every item in an array and add them all up.
  4. Searching an array8 minFind out whether something is there, where it is, and which is biggest.

unit 7

Your own commands

Wrap code up so you can use it again.

4 lessons · 32 min

  1. Making a function7 minWrap lines of code under one name and run them whenever you like.
  2. Giving it information8 minHand your function a value so it can do something new each time.
  3. Getting an answer back8 minMake a function hand you a result you can keep and use.
  4. Putting it all together9 minBuild a small program from functions, arrays, loops and decisions.
end of level 1 level check: a tiny quiz game Build one small project with everything from this level. Pass it and your face levels up. see the check

next, level 2

intermediate
typescript.

Build useful typed programs: shape real data, handle missing values and talk to a server safely.

see level 2