[swiftlint] Fix violation: unused_closure_parameter

warning: Unused Closure Parameter Violation: Unused parameters in a closure should be replaced with _.

Author: jawwad

B-Tree/Tests/Tests/BTreeTests.swift

@@ -31,7 +31,7 @@ class BTreeTests: XCTestCase {
   }
 
   func testInorderTraversalOfEmptyTree() {
-    bTree.traverseKeysInOrder { i in
+    bTree.traverseKeysInOrder { _ in
       XCTFail("Inorder travelsal fail.")
     }
   }

Topological Sort/Topological Sort.playground/Sources/TopologicalSort1.swift

@@ -19,7 +19,7 @@ extension Graph {
 
     let startNodes = calculateInDegreeOfNodes().filter({ _, indegree in
       return indegree == 0
-    }).map({ node, indegree in
+    }).map({ node, _ in
       return node
     })
 

Topological Sort/Topological Sort.playground/Sources/TopologicalSort2.swift

@@ -8,7 +8,7 @@ extension Graph {
     // topologically sorted list.
     var leaders = nodes.filter({ _, indegree in
       return indegree == 0
-    }).map({ node, indegree in
+    }).map({ node, _ in
       return node
     })
 

Topological Sort/TopologicalSort1.swift

@@ -19,7 +19,7 @@ extension Graph {
 
     let startNodes = calculateInDegreeOfNodes().filter({ _, indegree in
       return indegree == 0
-    }).map({ node, indegree in
+    }).map({ node, _ in
       return node
     })
 

Topological Sort/TopologicalSort2.swift

@@ -8,7 +8,7 @@ extension Graph {
     // topologically sorted list.
     var leaders = nodes.filter({ _, indegree in
       return indegree == 0
-    }).map({ node, indegree in
+    }).map({ node, _ in
       return node
     })