More lessons

koans.tm

@@ -14,6 +14,14 @@ LESSONS := [
     Lesson((./lessons/lesson-03-variables.tm), "Variables"),
     Lesson((./lessons/lesson-04-functions.tm), "Functions"),
     Lesson((./lessons/lesson-05-basic-types.tm), "Basic Types"),
+    Lesson((./lessons/lesson-06-arrays.tm), "Arrays"),
+    Lesson((./lessons/lesson-07-optionals.tm), "Optionals"),
+    Lesson((./lessons/lesson-08-tables.tm), "Tables"),
+    Lesson((./lessons/lesson-09-text), "Text"),
+    Lesson((./lessons/lesson-10-structs.tm), "Structs"),
+    Lesson((./lessons/lesson-11-enums.tm), "Enums"),
+    Lesson((./lessons/lesson-12-allocating.tm), "Allocating Memory"),
+    Lesson((./lessons/lesson-13-paths.tm), "File Paths"),
 ]
 
 enum TestResult(Success(output:Text), Error(err:Text), WrongOutput(actual:Text, expected:Text)):

lesson-templates/lesson-02-tests.tm

@@ -19,8 +19,4 @@ func main():
 
     # Edit this test so it passes:
     >> 2 + 2
-    = 9999
-
-    # For the rest of this tutorial, you won't
-    # be editing any of the tests, you'll be
-    # fixing code so it passes the tests.
+    = ???

lesson-templates/lesson-05-basic-types.tm

@@ -17,17 +17,17 @@ func main():
     d := yes
 
     >> a
-    = 99
+    = ???
     >> b
-    = 2.718
+    = ???
     >> c
-    = "Hello, world!"
+    = ???
     >> d
-    = no
+    = ???
 
     # Text values support interpolation using `$`:
     name := "Alice"
     greeting := "Hello, $name!"
 
     >> greeting
-    = "Hello, Bob!"
+    = ???

lesson-templates/lesson-06-arrays.tm

@@ -0,0 +1,37 @@
+# Arrays
+
+func main():
+
+    # Arrays are ordered collections of values.
+    # You can define an array using `[...]`:
+
+    nums := [10, 20, 30]
+
+    # Arrays are 1-indexed.
+    >> nums[2]
+    = ???
+
+    # Arrays can be empty but must have a type:
+    empty := [:Int]
+
+    >> empty
+    = []
+
+    # You can loop over an array with `for value in array`:
+    sum := 0
+    for num in nums:
+        sum += num
+
+    >> sum
+    = ???
+
+    # Array comprehensions let you transform arrays concisely:
+    squares := [n + 1 for n in nums]
+
+    >> squares
+    = [???]
+
+    # You can also get the index with `for index, value in array`:
+    for i, num in nums:
+        >> squares[i] == num * num
+        = yes

lesson-templates/lesson-07-optionals.tm

@@ -0,0 +1,55 @@
+# Optional Types
+
+func main():
+
+    # Any type `T` can be made optional with the syntax `T?`,
+    # meaning it can hold a value or be `none`.
+
+    x := 42?
+    >> x
+    = x
+
+    # You can assign a `none` value to `x` because it has type `Int?`
+    x = none
+
+    # To declare a `none` variable, specify its type:
+    y := none:Int
+
+    >> y
+    = ???
+
+    # Some functions return optional values:
+    >> Int.parse("123")
+    = ???
+    >> Int.parse("blah")
+    = ???
+
+    # You can check if a value exists with `if`:
+    n := Int.parse("123")
+    if n:
+        # Inside this condition, `n` is known to be non-none
+        n = add(n, 1)
+        >> n
+        = ???
+
+    # Optionals are useful for handling missing data:
+    name := none:Text
+    greeting := if name:
+        "Hello, $name!"
+    else:
+        "Hello, stranger!"
+
+    >> greeting
+    = ???
+
+    # Optional values can be converted to non-optional using `or`
+    >> Int.parse("blah") or 0
+    = ???
+
+    # They can also be converted using the `!` operator, which
+    # will give an error if a non-none value is encountered:
+    >> add(Int.parse("123")!, 1)
+    = ???
+
+func add(x:Int, y:Int -> Int):
+    return x + y

lesson-templates/lesson-08-tables.tm

@@ -0,0 +1,42 @@
+# Tables
+
+func main():
+
+    # Tables store key-value pairs.
+    # You can define a table using `{key = value, ...}`.
+
+    scores := {"Alice"=100, "Bob"=200}
+    >> scores
+    = {"Alice"=100, "Bob"=200}
+
+    >> scores["Alice"]
+    = ???
+
+    # Accessing a missing key gives `none`
+    >> scores["Zoltan"]
+    = ???
+
+    # Tables can be empty but must have key and value types:
+    empty := {:Text,Int}
+    >> empty
+    = {}
+
+    # You can loop over tables:
+    total := 0
+    for name, score in scores:
+        total += score
+
+    >> total
+    = 9999
+
+    # Table keys and values can be accessed as an array:
+    >> scores.keys
+    = [???]
+
+    >> scores.values
+    = [???]
+
+    # Table comprehensions let you create tables concisely:
+    doubled := {k = v * 2 for k, v in scores}
+    >> doubled
+    = {???}

lesson-templates/lesson-09-text.tm

@@ -0,0 +1,34 @@
+# Text
+
+func main():
+
+    # Text values are sequences of letters.
+    greeting := "Hello"
+
+    >> greeting.length
+    = ???
+
+    # Text supports interpolation with `$`:
+    name := "Alice"
+    message := "Hello, $name, your number is $(1 + 2)!"
+
+    >> message
+    = ???
+
+    # Multi-line text uses indented quotes:
+    multiline := "
+        line one
+        line two
+        line three
+    "
+
+    # Methods calls use `:`
+    >> multiline:lines()
+    = [???]
+
+    # Common text methods:
+    >> "hello":upper()
+    = ???
+
+    >> "hello":split()
+    = [???]

lesson-templates/lesson-10-structs.tm

@@ -0,0 +1,42 @@
+# Structs and Methods
+
+# The keyword `struct` is used to define structures
+# that hold multiple members:
+struct Point(x:Int, y:Int):
+
+    # Methods are any function defined inside of the
+    # indented area below a struct definition.
+
+    # There is no implicit `self` argument, only the
+    # arguments you explicitly define.
+    func absolute(p:Point -> Point):
+        return Point(p.x:abs(), p.y:abs())
+    
+    # Constants can be declared inside of a struct's namespace:
+    ZERO := Point(0, 0)
+
+    # Arbitrary functions can also be defined here:
+    func squared_int(x:Int -> Int):
+        return x * x
+
+func main():
+
+    # You can create a struct instance like this:
+    p := Point(x=3, y=4)
+
+    >> p
+    = Point(x=???, y=???)
+
+    >> Point.ZERO
+    = Point(x=???, y=???)
+
+    >> p.x
+    = ???
+    >> p.y
+    = ???
+
+    >> p.sum()
+    = ???
+
+    >> Point.squared_int(5)
+    = ???

lesson-templates/lesson-11-enums.tm

@@ -0,0 +1,37 @@
+# Enums
+
+# Enums define a type with multiple possible variants:
+enum Shape(Circle(radius: Num), Rectangle(width: Num, height: Num), Point):
+
+    # Use `when` to pattern match an enum:
+    func area(shape: Shape -> Num):
+        when shape is Circle(radius):
+            return Num.PI * radius * radius
+        is Rectangle(width, height):
+            return width * height
+        is Point:
+            return 0
+
+func main():
+
+    # You can create instances of an enum:
+    s1 := Shape.Point
+
+    # Single member enums display without the field names:
+    s2 := Circle(radius=10)
+    >> s1
+    = Circle(10)
+
+    # Multi-member enums explicitly list their field names:
+    s3 := Shape.Rectangle(width=4, height=5)
+    >> s3
+    = Rectangle(width=4, height=5)
+
+    >> s1:area()
+    = ???
+
+    >> s2:area()
+    = ???
+
+    >> "My shape is $s3"
+    = ???

lesson-templates/lesson-12-allocating.tm

@@ -0,0 +1,42 @@
+# Heap Allocation with `@`
+
+func main():
+
+    # By default, values in Tomo are immutable.
+    # To allow mutation, you need to allocate memory using `@`
+
+    nums := @[1, 2, 3]
+    nums[1] = 99
+
+    >> nums
+    = @[???, 2, 3]
+
+    nums:insert(40)
+    >> nums
+    = @[???, 2, 3, ???]
+
+    # Allocated memory is not equal to other allocated memory:
+    a := @[10, 20, 30]
+    b := @[10, 20, 30]
+    >> a == b
+    = ???
+
+    # The `[]` operator can be used to access the value stored
+    # at a memory location:
+    >> a[] == b[]
+    = ???
+
+    # Tables also require `@` to allow modifications:
+    scores := @{"Alice"=100, "Bob"=200}
+
+    scores["Charlie"] = 300
+
+    >> scores["Charlie"]
+    = ???
+
+    # Without `@`, attempting to mutate will cause an error:
+    frozen := {"key"="value"}
+    frozen["key"] = "new value"  # This should fail
+
+    >> frozen["key"]
+    = "new value"

lesson-templates/lesson-13-paths.tm

@@ -0,0 +1,47 @@
+# Paths
+
+func main():
+
+    # Tomo includes a built-in literal type for file paths
+    # A path is inside parentheses and begins with `/`, `~`, `.` or `..`
+
+    file := (/tmp/test-file.txt)
+    >> file
+    = /tmp/test-file.txt
+
+    file:write("first line")
+    >> file:read()
+    = "???"
+
+    file:append("
+
+        second line
+    ")
+
+    >> file:exists()
+    = yes
+
+    >> file:lines()
+    = [???]
+
+    # You can iterate over a file by lines:
+    >> upper_lines := [line:upper() for line in file:by_line()]
+    = [???]
+
+    >> file:parent()
+    = /???
+
+    >> file:extension()
+    = "???"
+
+    >> file:parent():child("other-file.txt")
+    = /???
+
+    >> dir := (/tmp/test-*.txt):glob()
+    = [???]
+
+    file:remove()
+
+    >> file:exists()
+    = ???
+