added 2-calc

Author: willrstern

2-calc/calc.js

@@ -0,0 +1,14 @@
+var math = require('./math');
+
+var command = process.argv[2];
+var arguments = process.argv.slice(3).map(function(arg) {
+  return parseFloat(arg);
+});
+
+if (math[command]) {
+  console.log("running:", command);
+  console.log(math[command].apply(math, arguments));
+} else {
+  console.log("command " + command + " not found!");
+  console.log("allowed commands are: ", Object.keys(math).join(', '));
+}

2-calc/math.js

@@ -0,0 +1,11 @@
+module.exports = {
+  add: function(x, y) {
+    return x+y;
+  },
+  subtract: function(x, y) {
+    return x-y;
+  },
+  squareRoot: function(x) {
+    return Math.sqrt(x);
+  }
+};