From 23b596f6b27e2631c5ba43f6969bbc3e7603ac7c Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 5 Nov 2014 10:51:25 -0500
Subject: [PATCH] fix #541 currency filter for negative numbers

---
 src/filters/index.js            | 5 +++--
 test/unit/specs/filters_spec.js | 4 ++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/filters/index.js b/src/filters/index.js
index 246c9f91525..cf3c5b23b93 100644
--- a/src/filters/index.js
+++ b/src/filters/index.js
@@ -52,13 +52,14 @@ exports.currency = function (value, sign) {
   value = parseFloat(value)
   if (!value && value !== 0) return ''
   sign = sign || '$'
-  var s = Math.floor(value).toString(),
+  var s = Math.floor(Math.abs(value)).toString(),
     i = s.length % 3,
     h = i > 0
       ? (s.slice(0, i) + (s.length > 3 ? ',' : ''))
       : '',
     f = '.' + value.toFixed(2).slice(-2)
-  return sign + h + s.slice(i).replace(digitsRE, '$1,') + f
+  return (value < 0 ? '-' : '') +
+    sign + h + s.slice(i).replace(digitsRE, '$1,') + f
 }
 
 /**
diff --git a/test/unit/specs/filters_spec.js b/test/unit/specs/filters_spec.js
index 92442fcbb79..013fd384f1a 100644
--- a/test/unit/specs/filters_spec.js
+++ b/test/unit/specs/filters_spec.js
@@ -58,6 +58,10 @@ describe('Filters', function () {
     expect(filter(false)).toBe('')
     expect(filter(null)).toBe('')
     expect(filter(undefined)).toBe('')
+    // negative numbers
+    expect(filter(-50)).toBe('-$50.00')
+    expect(filter(-150.43)).toBe('-$150.43')
+    expect(filter(-1500.4343434)).toBe('-$1,500.43')
   })
 
   it('key', function () {