Add Loops

Author: healeycodes

examples.txt

@@ -1 +1 @@
-Hello World,Values
+Hello World,Values,Loops

examples/loops.ink

@@ -0,0 +1,49 @@
+intro := 'In Ink, there isn\'t a <code>for</code> loop construct. Instead, tail recursion is used.
+          The standard library contains utility functions like <code>each</code>, <code>map</code>, <code>reduce</code>, <code>range</code>, and <code>filter</code>.'
+
+rows := [
+    {
+        docs: ''
+        code: 'std := load(\'../vendor/std\')
+log := std.log
+filter := std.filter
+range := std.range
+each := std.each
+
+start := 1
+end := 9
+step := 1
+'
+    },
+    {
+        docs: 'Like Python\'s <code>range</code>, we can create a composite value of the numbers 1 through 8 using <code>std.range</code>.'
+        code: 'numbers := range(start, end, step)
+log(numbers)
+'
+    },
+    {
+        docs: 'We can loop over these numbers with <code>std.each</code>.'
+        code: 'each(numbers, num => log(num))
+'
+    },
+    {
+        docs: 'Perhaps we only want the even numbers.'
+        code: 'evenNumbers := filter(numbers, num => num % 2 :: {
+    0 -> true
+    _ -> false
+})
+each(evenNumbers, num => log(num))
+'
+    },
+    {
+        docs: 'Or the sum if they were squared.'
+        code: 'squares := map(numbers, num => num * num)
+sumOfSquares := reduce(squares,
+    (acc, item) => acc + item, 0
+)
+log(sumOfSquares)
+'
+    }
+]
+
+end := ''

examples/values.ink

@@ -34,7 +34,12 @@ log(~authed)
         code: 'exists := ()
 log(exists)
 '
-    }
+    },
+    {
+        docs: 'Ink does not have immutable constants. By convention constant variables start with a capital letter. Otherwise, camelCase is used.'
+        code: 'Language := 'Ink'
+'
+    },
 ]
 
 end := ''