Convert a String to Camel Case Format in C++

Given a list of strings words, concatenate the strings in camel case format.

Example 1
Input

words = [“java”, “beans”]
Output

“javaBeans”
Example 2
Input

words = [“Go”, “nasa”]
Output

“goNasa”

How to Convert a String into Camel Case in C++?

C++ doesn’t offer a function to convert a string to either uppercase or lowercase. However, we can utilize the std::toupper and std::tolower to convert a char to its corresponding form. We can wrap it in a lambda function:

function<string(string)> stringToLower = [](string data) {
    std::transform(data.begin(), data.end(), data.begin(), [](unsigned char c){ 
        return std::tolower(c); 
    });
    return data;
};

Then, the rest is simpler, make the first word lowercase, and then the rest words first character uppercase.

string solve(vector<string>& words) {
    if (words.empty()) return "";
    function<string(string)> stringToLower = [](string data) {
        std::transform(data.begin(), data.end(), data.begin(), [](unsigned char c){ 
            return std::tolower(c); 
        });
        return data;
    };
    string ans = stringToLower(words[0]);
    for (int i = 1; i < words.size(); ++ i) {
        ans += (char)std::toupper(words[i][0]);
        ans += stringToLower(words[i].substr(1));
    }
    return ans;
}

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