From 8fbb7d4bccdc104e55d1c29293dc08ef4146ef01 Mon Sep 17 00:00:00 2001
From: willclarktech <willclarktech@users.noreply.github.com>
Date: Wed, 10 Jun 2020 13:40:42 +0100
Subject: [PATCH] Add comparison methods to Decimal

---
 packages/math/src/decimal.ts     | 25 +++++++++++++++++++++++++
 packages/math/types/decimal.d.ts |  6 ++++++
 2 files changed, 31 insertions(+)

diff --git a/packages/math/src/decimal.ts b/packages/math/src/decimal.ts
index e126e4ed..869401fb 100644
--- a/packages/math/src/decimal.ts
+++ b/packages/math/src/decimal.ts
@@ -118,4 +118,29 @@ export class Decimal {
     const sum = this.data.atomics.add(new BN(b.atomics));
     return new Decimal(sum.toString(), this.fractionalDigits);
   }
+
+  public compare(b: Decimal): number {
+    if (this.fractionalDigits !== b.fractionalDigits) throw new Error("Fractional digits do not match");
+    return this.data.atomics.cmp(new BN(b.atomics));
+  }
+
+  public equals(b: Decimal): boolean {
+    return this.compare(b) === 0;
+  }
+
+  public isLessThan(b: Decimal): boolean {
+    return this.compare(b) < 0;
+  }
+
+  public isLessThanOrEqual(b: Decimal): boolean {
+    return this.compare(b) <= 0;
+  }
+
+  public isGreaterThan(b: Decimal): boolean {
+    return this.compare(b) > 0;
+  }
+
+  public isGreaterThanOrEqual(b: Decimal): boolean {
+    return this.compare(b) >= 0;
+  }
 }
diff --git a/packages/math/types/decimal.d.ts b/packages/math/types/decimal.d.ts
index 9d65be9d..cae891b1 100644
--- a/packages/math/types/decimal.d.ts
+++ b/packages/math/types/decimal.d.ts
@@ -23,4 +23,10 @@ export declare class Decimal {
    * Both values need to have the same fractional digits.
    */
   plus(b: Decimal): Decimal;
+  compare(b: Decimal): number;
+  equals(b: Decimal): boolean;
+  isLessThan(b: Decimal): boolean;
+  isLessThanOrEqual(b: Decimal): boolean;
+  isGreaterThan(b: Decimal): boolean;
+  isGreaterThanOrEqual(b: Decimal): boolean;
 }