Add Longest Word in Swift (#4516)

Author: ShawnN003

archive/s/swift/longest-word.swift

@@ -0,0 +1,38 @@
+import Foundation
+
+if (CommandLine.arguments.count < 2) {
+    print("Usage: please provide a string")
+}
+else 
+{
+    var sentence = CommandLine.arguments[1]   
+    sentence = sentence.replacingOccurrences(of: "\n", with: "")    //removing the break line if it contains any
+    longestWord(input : sentence)
+}
+
+func longestWord(input : String) -> Void
+{
+    var longest = 0
+    var testWord = ""
+
+    if(input == "")
+    {
+         print("Usage: please provide a string")    //checking for empty string
+    }
+
+    else 
+    {
+        var substrings: [Substring] = []    //array to hold the array of the input strings
+        substrings = input.split(separator: " ")        //splitting the array by spaces
+        
+        for word in substrings    //iterate through the array
+        {
+            testWord = word.trimmingCharacters(in: CharacterSet(charactersIn: " "))
+            if(testWord.count > longest)    
+            {
+                longest = testWord.count    //obtaining the longest count of words
+            }
+        }
+        print(longest)
+    }
+}