WIP: create snippet dig.md . npm run tester failed.

snippets/dig.md

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+### dig
+
+Return the value in a nested JSON object by the key.
+
+Given the key name (or target), it will look up the key in the object recursively and return the first value if found.
+
+```
+const dig = (obj, target) => {
+  if (!obj) return;
+
+  if (obj[target]) return obj[target];
+  else {
+    return( Object.keys(obj).map(key => {
+     if (typeof(obj[key]) === "object") {
+        return dig(obj[key], target);
+      }
+    }).filter(defined => defined)[0] );
+  }
+};
+```
+
+```
+const data = {
+  name: "John Doe",
+  details: {
+    phone: "9876543210",
+    email: "john@example.com",
+    address: {
+      street: "123 ABC St.",
+      state: "CA",
+      zip: "98765"
+    },
+    extra1: {
+      nickName: "Johnny"
+    },
+    extra2: {
+      nickName: "JD"
+    },
+    hobby: "coding",
+    snacks: ["chips", 'candy', 'coke']
+  },
+  l1:{
+    l2:{
+      l3:{
+        l4: "4 levels deep."
+      }
+    }
+  }
+};
+
+dig(data, 'nickName'); // "Johnny"
+dig(data, 'hobby');    // "coding"
+dig(data, 'snacks');   // ["chips","candy","coke"]
+dig(data, 'l4');       // "4 levels deep."
+dig(data, 'blahblah')  // undefined
+```