Add static getter for zero value Int

Author: aaroncox

src/chain/integer.ts

@@ -50,6 +50,11 @@ export class Int implements ABISerializableObject {
         return this.isSigned ? this.max.ineg().isubn(1) : new BN(0)
     }
 
+    /** Return a zero value of this type */
+    static get zero() {
+        return this.from(0)
+    }
+
     /** Add `lhs` to `rhs` and return the resulting value. */
     static add(lhs: Int, rhs: Int, overflow: OverflowBehavior = 'truncate'): Int {
         return Int.operator(lhs, rhs, overflow, (a, b) => a.add(b))

test/integer.ts

@@ -177,6 +177,19 @@ suite('integer', function () {
             assert.ok(Number(bigValue))
         }, /Number can only safely store up to 53 bits/)
     })
+
+    test('zero', function () {
+        assert.isTrue(Int8.from(0).equals(Int8.zero))
+        assert.isTrue(Int16.from(0).equals(Int16.zero))
+        assert.isTrue(Int32.from(0).equals(Int32.zero))
+        assert.isTrue(Int64.from(0).equals(Int64.zero))
+        assert.isTrue(Int128.from(0).equals(Int128.zero))
+        assert.isTrue(UInt8.from(0).equals(UInt8.zero))
+        assert.isTrue(UInt16.from(0).equals(UInt16.zero))
+        assert.isTrue(UInt32.from(0).equals(UInt32.zero))
+        assert.isTrue(UInt64.from(0).equals(UInt64.zero))
+        assert.isTrue(UInt128.from(0).equals(UInt128.zero))
+    })
 })
 
 function assertInt(actual: Int, expected: number | string) {