kra3 · May 18, 2018 09:27 · May 18, 2018
diff --git a/removeFalseValuesRecurse.js b/removeFalseValuesRecurse.js
@@ -0,0 +1,34 @@
+import _isObjectLike from 'lodash/isObjectLike';
+import _size from 'lodash/size';
+
+function removeEmptyValuesRecursively(obj) {
+  return removeEmptyValues(obj);
+
+  function isFalsy(val) {
+    // return true, if val is empty [], empty {} or null
+
+    return !_isObjectLike(val) ? val === null : _size(val) <= 0;
+  }
+
+  function removeEmptyValues(data) {
+    if (_isObjectLike(data)) {
+      const result = Object.entries(data).reduce((res, [key, value]) => {
+        const newValue = removeEmptyValues(value);
+
+        if (!isFalsy(newValue)) {
+          res[key] = newValue;
+        }
+
+        return res;
+      }, Array.isArray(data) ? [] : {});
+
+      return isFalsy(result) ? undefined : result;
+    }
+
+    return isFalsy(data) ? undefined : data;
+  }
+}
+
+
+// removeEmptyValuesRecursively({a: { b: { d: {} } }) => undefined
+// removeEmptyValuesRecursively({a: { b: { d: {} c: 1 } }) => {a : { b : { c: 1} } }