1 files changed, 46 insertions, 0 deletions
diff --git a/sdv/docker/sdvmodel/website/mergeDeep.js b/sdv/docker/sdvmodel/website/mergeDeep.js
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+/* Copyright 2020 University Of Delhi.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+
+/**
+* Performs a deep merge of objects and returns new object. Does not modify
+* objects (immutable) and merges arrays via concatenation.
+*
+* @param {...object} objects - Objects to merge
+* @returns {object} New object with merged key/values
+*/
+function mergeDeep(...objects) {
+  const isObject = obj => obj && typeof obj === 'object';
+  
+  return objects.reduce((prev, obj) => {
+    Object.keys(obj).forEach(key => {
+      const pVal = prev[key];
+      const oVal = obj[key];
+      
+      if (Array.isArray(pVal) && Array.isArray(oVal)) {
+        prev[key] = pVal.concat(...oVal);
+      }
+      else if (isObject(pVal) && isObject(oVal)) {
+        prev[key] = mergeDeep(pVal, oVal);
+      }
+      else {
+        prev[key] = oVal;
+      }
+    });
+    
+    return prev;
+  }, {});
+}
+