DetectCapital.dart file

solution in Dart language

Author: Farial-mahmod

DetectCapital.dart

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+// Leetcode's Detect Capital problem's solution in Dart programming language
+// Link to the problem: https://leetcode.com/problems/detect-capital/
+// Result: Runtime: 395 ms, faster than 83.33% of Dart online submissions for Detect Capital, Memory Usage: 141.7 MB, less than 33.33% of Dart online submissions for Detect Capital.
+// Statement:
+// We define the usage of capitals in a word to be right when one of the following cases holds:
+   //  All letters in this word are capitals, like "USA".
+   // All letters in this word are not capitals, like "leetcode".
+   // Only the first letter in this word is capital, like "Google".
+// Given a string word, return true if the usage of capitals in it is right.
+
+
+// Solution:
+
+class Solution {
+  bool detectCapitalUse(String word) {
+
+      var capitalizedWord = word.toUpperCase();
+      var lowerWord = word.toLowerCase();
+      
+      // a String type List to store true or false value per character to compare capitals and smalls
+      List<String> storeToCheck = [];
+      
+      // Temporarily capitalizing the word to compare
+      String nowUpperCase = word.toUpperCase();
+      String nowLowerCase = word.toLowerCase();
+
+      if(word.length==1){
+          if(word==capitalizedWord) return true;
+      else if(word==lowerWord) return true;
+          
+      } else{
+            if(word==capitalizedWord) return true;
+            else if(word==lowerWord) return true;
+            for(int i=1; i<word.length; i++) {
+      if(isUpperCase(word[0]) && (isLowerCase(word[i]))){
+      storeToCheck.add("true");
+    }  
+      else{
+      storeToCheck.add("false");   
+    }     
+
+}
+      }
+      
+  return (storeToCheck.contains("false")) ? false : true;
+  }
+    // custom function to check lowercase letters
+    bool isLowerCase(String str) {
+        return str == str.toLowerCase();
+}
+    // custom function to check uppercase letters
+    bool isUpperCase(String str){
+        return str==str.toUpperCase();
+    }
+}