feat(currencyFilter): add fractionSize as optional parameter

currencyFilter accepts number of decimals to round off to

Closes angular#3642

Author: doshprompt

src/ng/filter/filters.js

@@ -11,6 +11,7 @@
  *
  * @param {number} amount Input to filter.
  * @param {string=} symbol Currency symbol or identifier to be displayed.
+ * @param {number=} fractionSize Number of decimal places to round the amount to.
  * @returns {string} Formatted number.
  *
  *
@@ -26,12 +27,14 @@
          <input type="number" ng-model="amount"> <br>
          default currency symbol ($): <span id="currency-default">{{amount | currency}}</span><br>
          custom currency identifier (USD$): <span>{{amount | currency:"USD$"}}</span>
+         no fractions (0): <span>{{amount | currency:"USD$":0}}</span>
        </div>
      </file>
      <file name="protractor.js" type="protractor">
        it('should init with 1234.56', function() {
          expect(element(by.id('currency-default')).getText()).toBe('$1,234.56');
          expect(element(by.binding('amount | currency:"USD$"')).getText()).toBe('USD$1,234.56');
+         expect(element(by.binding('amount | currency:"USD$":0')).getText()).toBe('USD$1,235');
        });
        it('should update', function() {
          if (browser.params.browser == 'safari') {
@@ -43,16 +46,18 @@
          element(by.model('amount')).sendKeys('-1234');
          expect(element(by.id('currency-default')).getText()).toBe('($1,234.00)');
          expect(element(by.binding('amount | currency:"USD$"')).getText()).toBe('(USD$1,234.00)');
+         expect(binding('amount | currency:"USD$":0')).toBe('(USD$1,234)');
        });
      </file>
    </example>
  */
 currencyFilter.$inject = ['$locale'];
 function currencyFilter($locale) {
   var formats = $locale.NUMBER_FORMATS;
-  return function(amount, currencySymbol){
+  return function(amount, currencySymbol, fractionSize){
     if (isUndefined(currencySymbol)) currencySymbol = formats.CURRENCY_SYM;
-    return formatNumber(amount, formats.PATTERNS[1], formats.GROUP_SEP, formats.DECIMAL_SEP, 2).
+    if (isUndefined(fractionSize) || isNaN(fractionSize) fractionSize = 2;
+    return formatNumber(amount, formats.PATTERNS[1], formats.GROUP_SEP, formats.DECIMAL_SEP, fractionSize).
                 replace(/\u00A4/g, currencySymbol);
   };
 }

test/ng/filter/filtersSpec.js

@@ -95,6 +95,7 @@ describe('filters', function() {
       expect(currency(0)).toEqual('$0.00');
       expect(currency(-999)).toEqual('($999.00)');
       expect(currency(1234.5678, "USD$")).toEqual('USD$1,234.57');
+      expect(currency(1234.5678, "USD$", 0)).toEqual('USD$1,235');
     });