render power data in table format

shared/utils/array.js

@@ -1,15 +1,13 @@
 class ArrayUtil {
 
   static diff(a1, a2){
-    a1.filter((a1n)=>{ return a2.indexOf(a1n) < 0; });
+    return a1.filter((a1n)=>{ return a2.indexOf(a1n) < 0; });
   }
 
   static selectMap(a, fnSelect, fnMap){
     var map = [];
     for (var elem of a){
-      if (fnSelect(elem)){
-        map.push(fnMap(elem));
-      }
+      if (fnSelect(elem)) map.push(fnMap(elem));
     }
     return map;
   }

shared/utils/math.js

@@ -26,7 +26,9 @@ export default class {
   }
 
   static inRange(n, min_max){
-    return n >= min_max[0] && n =< min_max[1];
+    var min = min_max[0],
+      max = min_max[1];
+    return ((n >= min) && (n <= max));
   }
 
 }