From db524b207a8a8dd311d04c71eb59e95907d0dd6e Mon Sep 17 00:00:00 2001
From: davidepastore <pasdavide@gmail.com>
Date: Wed, 11 Mar 2015 10:52:26 +0100
Subject: [PATCH] Add median filter

---
 README.md                       | 12 ++++++++++++
 src/_filter/math/median.js      | 26 ++++++++++++++++++++++++++
 src/filters.js                  |  1 +
 test/spec/filter/math/median.js | 25 +++++++++++++++++++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 src/_filter/math/median.js
 create mode 100644 test/spec/filter/math/median.js

diff --git a/README.md b/README.md
index 7a36cb4..fd3e482 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,7 @@
   - [shortFmt](#shortfmt)
   - [byteFmt](#bytefmt)
   - [kbFmt](#kbfmt)
+  - [median](#median)
 - [Boolean](#boolean)
   - [isNull](#isnull)
   - [isDefined](#isdefined)
@@ -1223,6 +1224,17 @@ Converts kilobytes into formatted display<br/>
 1 MB
 1.00126 GB
 
+```
+###median
+Calculates the median value of all values within an array<br/>
+**Usage:** ```array | median```,
+```html
+<p>{{ [1,2,3,4,5] | median }}</p>
+<p>{{ [2,8,2,12,2,1,5] | median }}</p>
+<!--result
+3
+2
+
 ```
 #Boolean
 >Used for boolean expression in chaining filters
diff --git a/src/_filter/math/median.js b/src/_filter/math/median.js
new file mode 100644
index 0000000..b069e69
--- /dev/null
+++ b/src/_filter/math/median.js
@@ -0,0 +1,26 @@
+/**
+ * @ngdoc filter
+ * @name median
+ * @kind function
+ *
+ * @description
+ * The median value of all values within an array
+ */
+angular.module('a8m.math.median', ['a8m.math'])
+  .filter('median', ['$filter', function ($filter) {
+    return function (input) {
+      var orderedArray = $filter('orderBy')(input);
+      
+      if(!isArray(input)){
+        return input;
+      }
+      
+      var medianIndex = parseInt(orderedArray.length / 2);
+      
+      if(orderedArray % 2 != 0){
+        medianIndex++;
+      }
+      
+      return orderedArray[medianIndex - 1];
+    }
+  }]);
diff --git a/src/filters.js b/src/filters.js
index c3048a4..97cbcb1 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.median',
 
   'a8m.angular',
   'a8m.conditions',
diff --git a/test/spec/filter/math/median.js b/test/spec/filter/math/median.js
new file mode 100644
index 0000000..bccf6d5
--- /dev/null
+++ b/test/spec/filter/math/median.js
@@ -0,0 +1,25 @@
+'use strict';
+
+describe('medianFilter', function () {
+
+  var filter;
+
+  beforeEach(module('a8m.math.median'));
+
+  beforeEach(inject(function ($filter) {
+    filter = $filter('median');
+  }));
+
+  it('should get an array of numbers and return the median one', function() {
+    expect(filter([1,2,3,4,5])).toEqual(3);
+    expect(filter([2,8,2,12,2,1,5])).toEqual(2);
+    expect(filter([1])).toEqual(1);
+  });
+
+  it('should get an !array and return it as-is', function() {
+    expect(filter('string')).toEqual('string');
+    expect(filter({})).toEqual({});
+    expect(filter(!0)).toBeTruthy();
+  });
+
+});