use shorter function syntax

controller/predicates/has_results_at_layers.js

@@ -8,36 +8,39 @@ const stackTraceLine = require('../../helper/stackTraceLine');
 // example usage: determining if the response contains only admin results
 
 module.exports = {
-  any: (layers) => (request, response) => {
-    const has_results_at_any_layer = !_.isEmpty(
-      _.intersection(
-        // convert layers to an array if it isn't already one
-        _.castArray(layers),
-        // pull all the layer properties into an array
-        _.map(response.data, _.property('layer'))
-    ));
-
-    debugLog.push(request, () => ({
-    reply: {[layers]: has_results_at_any_layer},
-    stack_trace: stackTraceLine()
-    }));
-    return has_results_at_any_layer;
+  any(layers) {
+    return (request, response) => {
+      const has_results_at_any_layer = !_.isEmpty(
+        _.intersection(
+          // convert layers to an array if it isn't already one
+          _.castArray(layers),
+          // pull all the layer properties into an array
+          _.map(response.data, _.property('layer'))
+      ));
 
+      debugLog.push(request, () => ({
+        reply: {[layers]: has_results_at_any_layer},
+        stack_trace: stackTraceLine()
+      }));
+      return has_results_at_any_layer;
+    };
   },
-  all: (layers) => (request, response) => {
-    const has_results_at_all_layers = _.isEmpty(
-      _.difference(
-        _.map(response.data, _.property('layer')),
-        _.castArray(layers)
-      )
-    );
+  all(layers) {
+    return (request, response) => {
+      const has_results_at_all_layers = _.isEmpty(
+        _.difference(
+          _.map(response.data, _.property('layer')),
+          _.castArray(layers)
+        )
+      );
 
-    debugLog.push(request, () => ({
-    reply: {[layers]: has_results_at_all_layers},
-    stack_trace: stackTraceLine()
-    }));
-    return has_results_at_all_layers;
+      debugLog.push(request, () => ({
+        reply: {[layers]: has_results_at_all_layers},
+        stack_trace: stackTraceLine()
+      }));
+      return has_results_at_all_layers;
 
+    };
   }
 
 };