add node modules to repo

node_modules/chainsaw/examples/add_do.js

@@ -0,0 +1,25 @@
+var Chainsaw = require('chainsaw');
+
+function AddDo (sum) {
+    return Chainsaw(function (saw) {
+        this.add = function (n) {
+            sum += n;
+            saw.next();
+        };
+        
+        this.do = function (cb) {
+            saw.nest(cb, sum);
+        };
+    });
+}
+
+AddDo(0)
+    .add(5)
+    .add(10)
+    .do(function (sum) {
+        if (sum > 12) this.add(-10);
+    })
+    .do(function (sum) {
+        console.log('Sum: ' + sum);
+    })
+;