Convert Money to number

src/util/currency.js

@@ -1,5 +1,6 @@
 import { trimEnd } from 'lodash';
 import Decimal from 'decimal.js';
+import { types } from './sdkLoader';
 
 ////////// Currency manipulation in string format //////////
 
@@ -148,3 +149,22 @@ export const convertUnitToSubUnit = (value, subUnitDivisor, useComma = false) =>
     throw new Error(`value must divisible by ${subUnitDivisor}`);
   }
 };
+
+/**
+ * Convert Money to a number
+ *
+ * @param {Money} value
+ *
+ * @param {Decimal|Number|String} subUnitDivisor - a ratio between currency's
+ * main unit and sub units
+ *
+ * @return {number} converted value
+ */
+export const convertMoneyToNumber = (value, subUnitDivisor) => {
+  if (!(value instanceof types.Money)) {
+    throw new Error('Value must be a Money type');
+  }
+  const subUnitDivisorAsDecimal = convertDivisorToDecimal(subUnitDivisor);
+  const amount = new Decimal(value.amount);
+  return amount.dividedBy(subUnitDivisorAsDecimal).toNumber();
+};

src/util/currency.test.js

@@ -1,6 +1,8 @@
 import Decimal from 'decimal.js';
+import { types } from './sdkLoader';
 import {
   convertDecimalToString,
+  convertMoneyToNumber,
   convertToDecimal,
   convertUnitToSubUnit,
   ensureSeparator,
@@ -182,4 +184,34 @@ describe('currency utils', () => {
       expect(() => convertUnitToSubUnit(1, 'asdf')).toThrowError();
     });
   });
+
+  describe('convertMoneyToNumber(value, subUnitDivisor)', () => {
+    const subUnitDivisor = 100;
+    const Money = types.Money;
+
+    it('Money as value', () => {
+      expect(convertMoneyToNumber(new Money(10, 'USD'), subUnitDivisor)).toEqual(0.1);
+      expect(convertMoneyToNumber(new Money(1000, 'USD'), subUnitDivisor)).toEqual(10);
+      expect(convertMoneyToNumber(new Money(9900, 'USD'), subUnitDivisor)).toEqual(99);
+      expect(convertMoneyToNumber(new Money(10099, 'USD'), subUnitDivisor)).toEqual(100.99);
+    });
+
+    it('Wrong type of a parameter', () => {
+      expect(() => convertMoneyToNumber(10, subUnitDivisor)).toThrowError(
+        'Value must be a Money type'
+      );
+      expect(() => convertMoneyToNumber('10', subUnitDivisor)).toThrowError(
+        'Value must be a Money type'
+      );
+      expect(() => convertMoneyToNumber(true, subUnitDivisor)).toThrowError(
+        'Value must be a Money type'
+      );
+      expect(() => convertMoneyToNumber({}, subUnitDivisor)).toThrowError(
+        'Value must be a Money type'
+      );
+      expect(() => convertMoneyToNumber(new Money('asdf', 'USD'), subUnitDivisor)).toThrowError(
+        '[DecimalError] Invalid argument'
+      );
+    });
+  });
 });