diff --git a/Sources/Rearrange/IndexSet+NSRange.swift b/Sources/Rearrange/IndexSet+NSRange.swift
index 5e2c35a..154441d 100644
--- a/Sources/Rearrange/IndexSet+NSRange.swift
+++ b/Sources/Rearrange/IndexSet+NSRange.swift
@@ -13,12 +13,20 @@ public extension IndexSet {
         self.init(integersIn: Range<IndexSet.Element>(range)!)
     }
 
+	init(ranges: [NSRange]) {
+		self.init()
+
+		insert(ranges: ranges)
+	}
+
     mutating func insert(range: NSRange) {
         insert(integersIn: Range<IndexSet.Element>(range)!)
     }
 
     mutating func insert(ranges: [NSRange]) {
-        ranges.forEach { insert(range: $0) }
+		for range in ranges {
+			insert(range: range)
+		}
     }
 
     mutating func remove(integersIn range: NSRange) {
diff --git a/Tests/RearrangeTests/IndexSetExtenstionTests.swift b/Tests/RearrangeTests/IndexSetExtenstionTests.swift
index c100c16..d701e69 100644
--- a/Tests/RearrangeTests/IndexSetExtenstionTests.swift
+++ b/Tests/RearrangeTests/IndexSetExtenstionTests.swift
@@ -8,7 +8,7 @@
 
 import XCTest
 
-class IndexSetExtenstionTests: XCTestCase {
+final class IndexSetExtenstionTests: XCTestCase {
     func testSpanningRange() {
         var set = IndexSet()
 
@@ -43,6 +43,13 @@ class IndexSetExtenstionTests: XCTestCase {
         XCTAssertEqual(set, IndexSet(integersIn: NSRange(location: 0, length: 5)))
     }
 
+	func testRangesInitializer() {
+		let ranges = [NSRange(0..<5), NSRange(5..<10)]
+		let set = IndexSet(ranges: ranges)
+
+		XCTAssertEqual(set, IndexSet(integersIn: 0..<10))
+	}
+
     func testIntersets() {
         var set = IndexSet()