Display only two fraction digits for fiat amount input

Author: tanx

src/helper.js

@@ -92,7 +92,11 @@ export const toAmount = (satoshis, settings) => {
   const num = settings.displayFiat
     ? calculateExchangeRate(satoshis, settings)
     : satoshis / UNITS[settings.unit].denominator;
-  const options = { useGrouping: false, maximumFractionDigits: 8 };
+  const options = {
+    useGrouping: false,
+    minimumFractionDigits: settings.displayFiat ? 2 : 0,
+    maximumFractionDigits: settings.displayFiat ? 2 : 8,
+  };
   return new Intl.NumberFormat('en-US', options).format(num);
 };
 

test/unit/helper.spec.js

@@ -363,31 +363,31 @@ describe('Helpers Unit Tests', () => {
     it('should work for number input (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(100000, settings);
-      expect(num, 'to equal', '6.89512515');
+      expect(num, 'to equal', '6.90');
     });
 
     it('should use period for decimals values (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(100000000, settings);
-      expect(num, 'to equal', '6895.12514652');
+      expect(num, 'to equal', '6895.13');
     });
 
     it('should work for 0 (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(0, settings);
-      expect(num, 'to equal', '0');
+      expect(num, 'to equal', '0.00');
     });
 
     it('should work for 1 (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(1, settings);
-      expect(num, 'to equal', '0.00006895');
+      expect(num, 'to equal', '0.00');
     });
 
     it('should work for 1000 (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(1000, settings);
-      expect(num, 'to equal', '0.06895125');
+      expect(num, 'to equal', '0.07');
     });
   });