Implemented Path(data)(path)(function(value))

Author: MarcusAurelius

JavaScript/path.js

@@ -0,0 +1,58 @@
+'use strict';
+
+function Path(data) {
+  return path => (
+    Maybe(path)(path => (
+      path.split('.').reduce(
+        (prev, key) => (prev[key] || {}),
+        (data || {})
+      )
+    ))
+  );
+}
+
+function Maybe(x) {
+  return fn => (x && fn) ? Maybe(fn(x)) : Maybe(null);
+}
+
+// Usage example:
+
+const fs = require('fs');
+
+let config = {
+  server: {
+    host: {
+      ip: '10.0.0.1',
+      port: 3000
+    },
+    ssl: {
+      key: {
+        filename: './path.js'
+      }
+    }
+  }
+};
+
+// Imperative style:
+
+if (
+  config &&
+  config.server &&
+  config.server.ssl &&
+  config.server.ssl.filename
+) {
+  let fileName = config.server.ssl.filename;
+  fs.readFile(fileName, (err, data) => {
+    if (data) {
+      console.log();
+    }
+  });
+}
+
+// Functional style:
+
+Path(config)('server.ssl.key.filename')(
+  file => fs.readFile(file, (err, data) => {
+    Maybe(data)(console.log);
+  })
+);