Merge pull request #351 from NEMStudios/task/g347_uint64_comparison

Added Uint64.compare

Author: rg911

src/model/UInt64.ts

@@ -79,6 +79,7 @@ export class UInt64 {
         }
         return true;
     }
+
     /**
      * Constructor
      * @param uintArray
@@ -135,4 +136,15 @@ export class UInt64 {
     public equals(other: UInt64): boolean {
         return this.lower === other.lower && this.higher === other.higher;
     }
+
+    /**
+     * Compares two UInt64
+     * @param other
+     * @returns {number} - -1, 0, 1
+     */
+    public compare(other: UInt64): number {
+        const long_a = Long.fromBits(this.lower, this.higher, true);
+        const long_b = Long.fromBits(other.lower, other.higher, true);
+        return long_a.compare(long_b);
+    }
 }

test/model/UInt64.spec.ts

@@ -93,6 +93,26 @@ describe('Uint64', () => {
         });
     });
 
+    describe('compare', () => {
+        it('should return -1 - unsigned', () => {
+            const value = UInt64.fromNumericString('1');
+            const other = UInt64.fromNumericString('2');
+            expect(value.compare(other)).to.be.equal(-1);
+        });
+
+        it('should return 0 - unsigned', () => {
+            const value = UInt64.fromNumericString('1');
+            const other = UInt64.fromNumericString('1');
+            expect(value.compare(other)).to.be.equal(0);
+        });
+
+        it('should return 1 - unsigned', () => {
+            const value = UInt64.fromNumericString('2');
+            const other = UInt64.fromNumericString('1');
+            expect(value.compare(other)).to.be.equal(1);
+        });
+    });
+
     describe('fromHex', () => {
         it('should create from hexadecimal notation', () => {
             hexTestCases.forEach((testCase) => {