Codewars 練習 08：比較巢狀結構

Array.prototype.sameStructureAs = function (other) {
    const that = this;
    if ( typeof(that) !== typeof(other) ) return false;
    if ( Array.isArray( other ) !== true ) return false;
    for ( var i = 0; i < that.length; i++ ){
      if ( Array.isArray(that[i]) ) {
        if ( that[i].length !== other[i].length ) return false;
        return that[i].sameStructureAs( other[i] );
      } else {
        if ( Array.isArray(other[i])  ) return false;
      }
    }
    return true;
};

Array.prototype.sameStructureAs = function (other) {
    return (this.length === other.length) ? this.every(function(el, i){
      return Array.isArray(el) ? el.sameStructureAs(other[i]) : true;
    }) : false;
};