Function optionToInt

src/echo.js:50–52

(opt, fallback)

    var offsetVertical = opts.offsetVertical || offsetAll;
    var offsetHorizontal = opts.offsetHorizontal || offsetAll;
    var optionToInt = function (opt, fallback) {
      return parseInt(opt || fallback, 10);
    };
    offset = {
      t: optionToInt(opts.offsetTop, offsetVertical),
      b: optionToInt(opts.offsetBottom, offsetVertical),