Function to convert snake case to camelCase (ES6+)

convert.md

/**
 * Change string from snake case to camelCase
 *
 * @param {string} str Input snake case string
 * @return {string} Output camel case string
 */
function toCamelCase(str) {
  str = str.replace(/[-_\s]+(.)?/g, (match, ch) => // eslint-disable-line no-param-reassign
    (ch ? ch.toUpperCase() : ''),
  );

  // Ensure first chat is always lowercase
  return str.substr(0, 1).toLowerCase() + str.substr(1);
};