ES5

Author: ahocevar

Diff for: index.js

@@ -2,7 +2,8 @@ var D2R = 0.01745329251994329577;
 import parser from './parser';
 import {sExpr} from './process';
 
-
+var knownTypes = ['PROJECTEDCRS', 'PROJCRS', 'GEOGCS', 'GEOCCS', 'PROJCS', 'LOCAL_CS', 'GEODCRS',
+  'GEODETICCRS', 'GEODETICDATUM', 'ENGCRS', 'ENGINEERINGCRS'];
 
 function rename(obj, params) {
   var outName = params[0];
@@ -21,24 +22,24 @@ function d2r(input) {
 
 function cleanWKT(wkt) {
   var keys = Object.keys(wkt);
-  keys.forEach(key => {
+  for (var i = 0, ii = keys.length; i <ii; ++i) {
+    var key = keys[i];
     // the followings are the crs defined in
     // https://github.com/proj4js/proj4js/blob/1da4ed0b865d0fcb51c136090569210cdcc9019e/lib/parseCode.js#L11
-    if (['PROJECTEDCRS', 'PROJCRS', 'GEOGCS', 'GEOCCS', 'PROJCS', 'LOCAL_CS', 'GEODCRS',
-      'GEODETICCRS', 'GEODETICDATUM', 'ENGCRS', 'ENGINEERINGCRS'].includes(key)) {
-        setPropertiesFromWkt(wkt[key]);
-    };
+    if (knownTypes.indexOf(key) !== -1) {
+      setPropertiesFromWkt(wkt[key]);
+    }
     if (typeof wkt[key] === 'object') {
       cleanWKT(wkt[key]);
     }
-  });
+  }
 }
 
 function setPropertiesFromWkt(wkt) {
   if (wkt.AUTHORITY) {
     var authority = Object.keys(wkt.AUTHORITY)[0];
     if (authority && authority in wkt.AUTHORITY) {
-      wkt.title = `${authority}:${wkt.AUTHORITY[authority]}`;
+      wkt.title = authority + ':' + wkt.AUTHORITY[authority];
     }
   }
   if (wkt.type === 'GEOGCS') {