Add support for arrow functions to filter filter.

Author: antoineveldhoven

src/twig.filters.js

@@ -835,6 +835,17 @@ module.exports = function (Twig) {
         },
         spaceless(value) {
             return value.replace(/>\s+</g, '><').trim();
+        },
+        filter(value, params) {
+            if (is('Array', value)) {
+                return value.filter(_a => {
+                    const data = {};
+                    data[params.params] = _a;
+
+                    const template = Twig.exports.twig({data: params.body});
+                    return template.render(data) === 'true';
+                });
+            }
         }
     };
 

test/test.filters.js

@@ -859,6 +859,18 @@ describe('Twig.js Filters ->', function () {
         });
     });
 
+    describe('filter ->', function () {
+        it('should filter an array (with perenthesis)', function () {
+            let testTemplate = twig({data: '{{ [1,5,2,7,8]|filter((f) => f % 2 == 0) }}'});
+            testTemplate.render().should.equal('2,8');
+        });
+
+        it('should filter an array (without perenthesis)', function () {
+            let testTemplate = twig({data: '{{ [1,5,2,7,8]|filter(f => f % 2 == 0) }}'});
+            testTemplate.render().should.equal('2,8');
+        });
+    });
+
     it('should chain', function () {
         const testTemplate = twig({data: '{{ ["a", "b", "c"]|keys|reverse }}'});
         testTemplate.render().should.equal('2,1,0');