chore: extract isnegativezero

Author: vladimirivanoviliev

src/common/is-negative-zero.js

@@ -0,0 +1,3 @@
+export default function isNegativeZero(value) {
+    return (1 / value === -Infinity);
+}

src/numbers/custom-number-format.js

@@ -1,4 +1,5 @@
 import { CURRENCY, PERCENT, LIST_SEPARATOR, GROUP_SEPARATOR, CURRENCY_PLACEHOLDER, PERCENT_PLACEHOLDER, POINT, EMPTY } from '../common/constants';
+import isNegativeZero from '../common/is-negative-zero';
 import formatCurrencySymbol from './format-currency-symbol';
 import groupInteger from './group-integer';
 import round from '../common/round';
@@ -273,7 +274,7 @@ export default function customNumberFormat(number, format, info) {
     const formatOptions = {
         negative: number < 0,
         number: Math.abs(number),
-        negativeZero: (1 / number === -Infinity),
+        negativeZero: isNegativeZero(number),
         format: format
     };
 

src/numbers/standard-number-format.js

@@ -1,4 +1,5 @@
 import { PERCENT, SCIENTIFIC, NUMBER_PLACEHOLDER, CURRENCY_PLACEHOLDER, PERCENT_PLACEHOLDER, EMPTY, POINT } from '../common/constants';
+import isNegativeZero from '../common/is-negative-zero';
 import formatCurrencySymbol from './format-currency-symbol';
 import groupInteger from './group-integer';
 import isCurrencyStyle from './is-currency-style';
@@ -95,7 +96,7 @@ export default function standardNumberFormat(number, options, info) {
     value = round(value, maximumFractionDigits);
 
     const negative = value < 0;
-    const negativeZero = (1 / number === -Infinity);
+    const negativeZero = isNegativeZero(number);
 
     const parts = value.split(POINT);
 

test/numbers.js

@@ -341,6 +341,10 @@ describe('standard accounting formatting', () => {
         delete cldr.custom;
     });
 
+    it('should support minus zero', () => {
+        expect(formatNumber(-0, 'a2')).toEqual("($0.00)");
+    });
+
     it('should apply format', () => {
         expect(formatNumber(10, 'a', 'custom')).toEqual("10.00$");
     });
@@ -405,6 +409,10 @@ describe('custom formatting', () => {
         expect(formatNumber(10.9, '#')).toEqual("11");
     });
 
+    it('should support minus zero with custom format', () => {
+        expect(formatNumber(-0, '0.00;(0.00)')).toEqual("(0.00)");
+    });
+
     it('replaces whole part of the number', () => {
         expect(formatNumber(-0, '#')).toEqual("-0");
     });