Merge pull request #10 from orchetect/dev

Added `Decimal.truncatingRemainder(dividingBy:)`
orchetect · Jul 31, 2021 · 682f6c4 · 682f6c4
2 parents f67728f + d4ad41f
commit 682f6c4
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diff --git a/Sources/OTCore/Extensions/Foundation/Decimal.swift b/Sources/OTCore/Extensions/Foundation/Decimal.swift
@@ -252,6 +252,17 @@ extension Decimal {
 
 extension Decimal {
 
+    /// **OTCore:**
+    /// Similar to `Double.truncatingRemainder(dividingBy:)` from the standard Swift library.
+    public func truncatingRemainder(dividingBy rhs: Self) -> Self {
+
+        let calculation = self / rhs
+        let integral = calculation.truncated(decimalPlaces: 0)
+        let fraction = self - (integral * rhs)
+        return fraction
+
+    }
+
     /// **OTCore:**
     /// Similar to `Int.quotientAndRemainder(dividingBy:)` from the standard Swift library.
     public func quotientAndRemainder(dividingBy rhs: Self) -> (quotient: Self, remainder: Self) {

diff --git a/Tests/OTCoreTests/Extensions/Foundation/Decimal Tests.swift b/Tests/OTCoreTests/Extensions/Foundation/Decimal Tests.swift
@@ -126,6 +126,14 @@ class Extensions_Foundation_Decimal_Tests: XCTestCase {
 
     }
 
+    func testTruncatingRemainder() {
+
+        let tr = Decimal(string: "20.5")!.truncatingRemainder(dividingBy: Decimal(8))
+
+        XCTAssertEqual(tr, Decimal(string: "4.5")!)
+
+    }
+
     func testQuotientAndRemainder() {
 
         let qr = Decimal(string: "17.5")!.quotientAndRemainder(dividingBy: 5.0)