From 4f018174ff8404e558a7b63d220c3b5cdcf8645b Mon Sep 17 00:00:00 2001
From: davidepastore <pasdavide@gmail.com>
Date: Sun, 22 Feb 2015 00:58:35 +0100
Subject: [PATCH] Add mode filter

---
 README.md                     |  9 +++++++++
 src/_filter/math/mode.js      | 36 +++++++++++++++++++++++++++++++++++
 src/filters.js                |  1 +
 test/spec/filter/math/mode.js | 27 ++++++++++++++++++++++++++
 4 files changed, 73 insertions(+)
 create mode 100644 src/_filter/math/mode.js
 create mode 100644 test/spec/filter/math/mode.js

diff --git a/README.md b/README.md
index 77ad954..d3a472c 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,7 @@
   - [shortFmt](#shortfmt)
   - [byteFmt](#bytefmt)
   - [kbFmt](#kbfmt)
+  - [mode] (#mode)
 - [Boolean](#boolean)
   - [isNull](#isnull)
   - [isDefined](#isdefined)
@@ -1222,6 +1223,14 @@ Converts kilobytes into formatted display<br/>
 1 MB
 1.00126 GB
 
+```
+###mode
+Calculates the mode value from all values within an array<br/>
+**Usage:** ```array | mode```
+```html
+{{ [12,7,5,7] | mode }}
+<!--result
+7
 ```
 #Boolean
 >Used for boolean expression in chaining filters
diff --git a/src/_filter/math/mode.js b/src/_filter/math/mode.js
new file mode 100644
index 0000000..790a6d5
--- /dev/null
+++ b/src/_filter/math/mode.js
@@ -0,0 +1,36 @@
+/**
+ * @ngdoc filter
+ * @name mode
+ * @kind function
+ *
+ * @description
+ * Math.mode will get an array and return the mode value.
+ */
+angular.module('a8m.math.mode', ['a8m.math'])
+  .filter('mode', ['$math', function ($math) {
+    return function (input) {
+
+      if(!isArray(input)) {
+        return input;
+      }
+      
+      var modeMap = {};
+      var mode = input[0];
+      var maxCount = 1;
+      for (var i = 0; i < input.length; i++) {
+          var val = input[i];
+          if(isDefined(modeMap[val])){
+              modeMap[val]++;
+          } else {
+              modeMap[val] = 1;
+          }
+          
+          if(modeMap[val] > maxCount){
+    		  mode = val;
+    		  maxCount = modeMap[val];
+    	  }
+      }
+
+      return mode;
+    };
+  }]);
\ No newline at end of file
diff --git a/src/filters.js b/src/filters.js
index c3048a4..1078f77 100644
--- a/src/filters.js
+++ b/src/filters.js
@@ -66,6 +66,7 @@ angular.module('angular.filter', [
   'a8m.math.byteFmt',
   'a8m.math.kbFmt',
   'a8m.math.shortFmt',
+  'a8m.math.mode',
 
   'a8m.angular',
   'a8m.conditions',
diff --git a/test/spec/filter/math/mode.js b/test/spec/filter/math/mode.js
new file mode 100644
index 0000000..0c45efc
--- /dev/null
+++ b/test/spec/filter/math/mode.js
@@ -0,0 +1,27 @@
+'use strict';
+
+describe('modeFilter', function () {
+
+  var filter;
+
+  beforeEach(module('a8m.math.mode'));
+
+  beforeEach(inject(function ($filter) {
+    filter = $filter('mode');
+  }));
+
+  it('should get an array of numbers and return the mode', function() {
+    expect(filter([1,2,3,4,5])).toEqual(1);
+    expect(filter([2,0,2,2,2])).toEqual(2);
+    expect(filter([1,2.32,2.32,7,5])).toEqual(2.32);
+    expect(filter([4])).toEqual(4);
+  });
+
+
+  it('should get an !array and return it as-is', function() {
+    expect(filter('string')).toEqual('string');
+    expect(filter({})).toEqual({});
+    expect(filter(!0)).toBeTruthy();
+  });
+
+});