Issue598 (#599)

* Add rule for nouns ending in -nses * Added tests for plural of expense and defense
NaturalNode · Apr 1, 2021 · 36a646c · 36a646c
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diff --git a/lib/natural/inflectors/noun_inflector.js b/lib/natural/inflectors/noun_inflector.js
@@ -137,6 +137,10 @@ const NounInflector = function () {
   // handkerchief - handkerchiefs / handkerchieves
   this.singularForms.regularForms.push([/(.*)ves$/i, '$1f'])
 
+  // expenses - expense
+  // defenses - defense
+  this.singularForms.regularForms.push([/(.*)nses$/i, '$1nse'])
+
   this.singularForms.regularForms.push([/([^v])ies$/i, '$1y'])
   this.singularForms.regularForms.push([/ives$/i, 'ife'])
   this.singularForms.regularForms.push([/(antenn|formul|nebul|vertebr|vit)ae$/i, '$1a'])

diff --git a/spec/noun_inflector_spec.js b/spec/noun_inflector_spec.js
@@ -357,5 +357,13 @@ describe('noun inflector', function () {
       expect(myInflector.singularize('wharves')).toBe('wharf')
       expect(myInflector.singularize('handkerchieves')).toBe('handkerchief')
     })
+
+    it('should handle words ending in rf', function () {
+      const myInflector = new NounInflector()
+      expect(myInflector.singularize('expenses')).toBe('expense')
+      expect(myInflector.singularize('defenses')).toBe('defense')
+      expect(myInflector.pluralize('expense')).toBe('expenses')
+      expect(myInflector.pluralize('defense')).toBe('defenses')
+    })
   })
 })