code: function startsWith(src, target) {
    if (target && target.length > 0) {
      return (src.substr(0, target.length) === target);
    } else {
      return false;
    }
  }
docs: Checks whether or not 'src' string starts with 'target' string
  @param {String}      src     source string to look into
  @param {String}      target  string to find at the beginning
  @returns {boolean}   true    if 'src' has 'target' at his beginning