how to add or drop a column in migration laravel code example

Example 1: laravel migration remove column

public function up()
{
  Schema::table('table', function($table) {
    $table->dropColumn('column_name');
  });
}

Example 2: drop column migration laravel

Class RemoveCommentViewCount extends Migration
  {
      public function up()
      {
          Schema::table('articles', function($table) {
             $table->dropColumn('comment_count');
             $table->dropColumn('view_count');
          });
      }

      public function down()
      {
          Schema::table('articles', function($table) {
             $table->integer('comment_count');
             $table->integer('view_count');
          });
      }
  }