String-related problems are frequently presented in coding tests. In this course, we will address string searching problems and write algorithms and code to solve them.<\/p>\n
Let’s solve the following problem:<\/p>\n
Given a string This problem is a basic one dealing with strings, requiring simple string manipulation skills. The solution process is as follows:<\/p>\n Now let’s implement the above algorithm in Kotlin:<\/p>\n The above code functions as follows:<\/p>\n Now let’s write some test cases to verify that the code is functioning correctly.<\/p>\n In this lesson, we learned how to handle strings simply in Kotlin through a string searching problem. String exploration and manipulation are fundamentals of problem-solving and are frequently encountered in real coding tests. Apply the above code in various scenarios and challenge yourself with other string-related problems!<\/p>\n This has been the Kotlin coding test tutorial. Thank you!<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"s<\/code> and a word word<\/code>, write a function that counts and returns the number of times the word appears in the string. Note that case is ignored, and the word is recognized only as a separate entity separated by spaces.<\/p>\nInput Example<\/h4>\n
\ns = \"Kotlin is a programming language. kotlin is a functional programming language.\"\nword = \"kotlin\"\n<\/pre>\n
Output Example<\/h4>\n
\n2\n<\/pre>\n
Problem Solving Process<\/h3>\n
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Code Implementation<\/h3>\n
fun countWordOccurrence(s: String, word: String): Int {\n \/\/ 1. Convert the string to lowercase\n val normalizedString = s.toLowerCase()\n \/\/ 2. Separate the string based on spaces\n val words = normalizedString.split(\" \")\n \/\/ 3. Count of the same word\n return words.count { it == word.toLowerCase() }\n}\n\n\/\/ Example usage\nfun main() {\n val s = \"Kotlin is a programming language. kotlin is a functional programming language.\"\n val word = \"kotlin\"\n val occurrenceCount = countWordOccurrence(s, word)\n println(occurrenceCount) \/\/ Output: 2\n}<\/code><\/pre>\nCode Explanation<\/h3>\n
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s.toLowerCase()<\/code> method to convert the given string to lowercase.<\/li>\nsplit(\" \")<\/code> method to split the string based on spaces, generating a list of words.<\/li>\ncount { it == word.toLowerCase() }<\/code>.<\/li>\n<\/ul>\nTest Cases<\/h3>\n
fun runTests() {\n val testCases = listOf(\n Pair(\"Kotlin is a programming language. kotlin is a functional programming language.\", \"kotlin\") to 2,\n Pair(\"This is a test string. The test is important.\", \"test\") to 2,\n Pair(\"Kotlin and Java are different languages. JAVA is an object-oriented language.\", \"java\") to 2,\n Pair(\"String searching problem\", \"none\") to 0\n )\n\n for ((input, expected) in testCases) {\n val (s, word) = input\n val result = countWordOccurrence(s, word)\n println(\"Input: \\\"$s\\\", Word: \\\"$word\\\", Expected Result: $expected, Actual Result: $result\")\n }\n}\n\n\/\/ Run tests\nrunTests()\n<\/code><\/pre>\nConclusion<\/h3>\n