new tasks

Task/Balanced_brackets/CoffeeScript/balanced_brackets-2.coffee

@@ -0,0 +1,17 @@
+> coffee balanced.coffee
+[[[[ false
+[[[] false
+[[][ false
+[[]] true
+[][[ false
+[][] true
+[]][ false
+[]]] false
+][[[ false
+][[] false
+][][ false
+][]] false
+]][[ false
+]][] false
+]]][ false
+]]]] false

Task/Balanced_brackets/CoffeeScript/balanced_brackets.coffee

@@ -0,0 +1,15 @@
+isBalanced = (brackets) ->
+  openCount = 0
+  for bracket in brackets
+    openCount += if bracket is '[' then 1 else -1
+    return false if openCount < 0
+  openCount is 0
+
+bracketsCombinations = (n) ->
+  for i in [0...Math.pow 2, n]
+    str = i.toString 2
+    str = '0' + str while str.length < n
+    str.replace(/0/g, '[').replace(/1/g, ']')
+
+for brackets in bracketsCombinations 4
+  console.log brackets, isBalanced brackets