upload

src/reduce.js

 var _ = require("lodash");
-var arr = [
-  { name: 'A', a: 1, b: 2 },
-  { name: 'A', a: 2, b: 3 },
-  { name: 'B', a: 1, b: 2 },
-  { name: 'C', a: 4, b: 5 },
-  { name: 'C', a: 5, b: 6 },
-  { name: 'C', a: 1, b: 1 },
-  { name: 'D', a: 7, b: 8 }
+
+var analysis_state_data = [
+{ "start_time": "2020-05-12 12:58:29", "end_time": "2020-05-12 13:02:06"},
+{ "start_time": "2020-05-12 13:02:06",	"end_time": "2020-05-12 13:08:08"},
+{ "start_time": "2020-05-12 13:08:08",	"end_time": "2020-05-12 13:08:21"},
+{ "start_time": "2020-05-12 13:08:08",	"end_time": "2020-05-12 13:08:26"},
+{ "start_time": "2020-05-12 13:08:21",	"end_time": "2020-05-12 13:08:57"},
+{ "start_time": "2020-05-12 13:09:43",	"end_time": "2020-05-12 13:10:10"}
 ];
 
-var r = _.chain(arr).reduce(function(prev, curr){
-  if (_.has(prev, curr.name)) {
-    var temp = prev[curr.name];
-    temp.a = temp.a + curr.a;
-    temp.b = temp.b + curr.b;
-  } else {
-    prev[curr.name] = curr;
-  }
-  return prev;
-}, {}).values().value();
+analysis_state_data = _.reduce(analysis_state_data, function(prev, curr, index){
+    if (prev.length > 0) {
+        if (curr.start_time == prev[prev.length - 1].start_time) {
+            prev[prev.length - 1] = curr;
+        } else {
+            prev.push(curr);
+        }
+    } else {
+        prev.push(curr);
+    }
+    return prev;
+}, []);
 
-print(JSON.stringify(r, null, '  '));
+print(JSON.stringify(analysis_state_data, null, ' '));
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