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express-server/node_modules/undefsafe/README.md

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+# undefsafe
+
+Simple *function* for retrieving deep object properties without getting "Cannot read property 'X' of undefined"
+
+Can also be used to safely set deep values.
+
+## Usage
+
+```js
+var object = {
+  a: {
+    b: {
+      c: 1,
+      d: [1,2,3],
+      e: 'remy'
+    }
+  }
+};
+
+console.log(undefsafe(object, 'a.b.e')); // "remy"
+console.log(undefsafe(object, 'a.b.not.found')); // undefined
+```
+
+Demo: [https://jsbin.com/eroqame/3/edit?js,console](https://jsbin.com/eroqame/3/edit?js,console)
+
+## Setting
+
+```js
+var object = {
+  a: {
+    b: [1,2,3]
+  }
+};
+
+// modified object
+var res = undefsafe(object, 'a.b.0', 10);
+
+console.log(object); // { a: { b: [10, 2, 3] } }
+console.log(res); // 1 - previous value
+```
+
+## Star rules in paths
+
+As of 1.2.0, `undefsafe` supports a `*` in the path if you want to search all of the properties (or array elements) for a particular element.
+
+The function will only return a single result, either the 3rd argument validation value, or the first positive match. For example, the following github data:
+
+```js
+const githubData = {
+        commits: [{
+          modified: [
+            "one",
+            "two"
+          ]
+        }, /* ... */ ]
+      };
+
+// first modified file found in the first commit
+console.log(undefsafe(githubData, 'commits.*.modified.0'));
+
+// returns `two` or undefined if not found
+console.log(undefsafe(githubData, 'commits.*.modified.*', 'two'));
+```