1.2 CamelCase created by smillaraaq - https://repl.it/GtLj/2

1.2 CamelCase.js

function undertocamel(undername) {
  var camelCaseOutput = "";
  var foundUnder = false;
  for(var i = 0; i<undername.length; i++) {
    // undername[i];
    if (undername[i] === "_") {
      foundUnder = true;
    } else {
      if (foundUnder) {
        camelCaseOutput += undername[i].toUpperCase();
        foundUnder = false;
      } else {
        camelCaseOutput += undername[i];
      }
    }
  }
  return camelCaseOutput;
}
undertocamel("apply_now");