Convertors.js

/**
 * Separate functions for each case conversion we support
 *   lower
 *   camel
 *   ... more will be added in future
 */

function convertToLower(...words)
{ 
    let result = "";

    // Concatenate each element as lower
    for (word of words) {
        result += word
            .toString()
            .trim()
            .toLowerCase();
    }
    return result;
}

function convertToCamel(...words) { 
    let result = "";

    // first word is lower
    result = words[0]
        .toString()
        .trim()
        .toLowerCase();

    // Now rest of the words are Proper case
    for (let offset = 1;
        offset < words.length;
        offset++) {

        // First letter upper
        result += words[offset]
            .slice(0, 1)
            .toUpperCase();

        // Rest all lower
        result += words[offset]
            .slice(1)
            .toLowerCase();
    }
    return result;
}