tasks a-s

Task/Pascals-triangle/CoffeeScript/pascals-triangle.coffeescript

@@ -0,0 +1,28 @@
+pascal = (n) ->
+  width = 6
+  for r in [1..n]
+    s = ws (width/2) * (n-r) # center row
+    output = (n) -> s += pad width, n
+    cell = 1
+    output cell
+    # Compute binomial coefficients as you go
+    # across the row.
+    for c in [1...r]
+      cell *= (r-c) / c
+      output cell
+    console.log s
+
+ws = (n) ->
+  s = ''
+  s += ' ' for i in [0...n]
+  s
+
+pad = (cnt, n) ->
+  s = n.toString()
+  # There is probably a better way to do this.
+  cnt -= s.length
+  right = Math.floor(cnt / 2)
+  left = cnt - right
+  ws(left) + s + ws(right)
+
+pascal(7)