resolves #1177 - add '!=' filter operation

Author: etpinard

src/transforms/filter.js

@@ -15,7 +15,7 @@ var axisIds = require('../plots/cartesian/axis_ids');
 var autoType = require('../plots/cartesian/axis_autotype');
 var setConvert = require('../plots/cartesian/set_convert');
 
-var INEQUALITY_OPS = ['=', '<', '>=', '>', '<='];
+var INEQUALITY_OPS = ['=', '!=', '<', '>=', '>', '<='];
 var INTERVAL_OPS = ['[]', '()', '[)', '(]', '][', ')(', '](', ')['];
 var SET_OPS = ['{}', '}{'];
 
@@ -57,6 +57,7 @@ exports.attributes = {
             'Sets the filter operation.',
 
             '*=* keeps items equal to `value`',
+            '*!=* keeps items not equal to `value`',
 
             '*<* keeps items less than `value`',
             '*<=* keeps items less than or equal to `value`',
@@ -262,6 +263,9 @@ function getFilterFunc(opts, d2c, targetCalendar) {
         case '=':
             return function(v) { return d2cTarget(v) === coercedValue; };
 
+        case '!=':
+            return function(v) { return d2cTarget(v) !== coercedValue; };
+
         case '<':
             return function(v) { return d2cTarget(v) < coercedValue; };
 

test/jasmine/tests/transform_filter_test.js

@@ -595,6 +595,23 @@ describe('filter transforms calc:', function() {
             _assert(out, ['2015-07-20'], [1], [0.1]);
         });
 
+        it('with operation *!=*', function() {
+            var out = _transform([Lib.extendDeep({}, _base, {
+                transforms: [{
+                    operation: '!=',
+                    value: '2015-07-20',
+                    target: 'x'
+                }]
+            })]);
+
+            _assert(
+                out,
+                ['2016-08-01', '2016-09-01', '2016-10-21', '2016-12-02'],
+                [2, 3, 1, 5],
+                [0.2, 0.3, 0.1, 0.2]
+            );
+        });
+
         it('with operation *<*', function() {
             var out = _transform([Lib.extendDeep({}, _base, {
                 transforms: [{