arr[-1,-1]_在Ruby中使用-运算符(new_array-> arr-old_array)创建数组实例
arr[-1,-1]Inthelastarticle,wehavegonethroughthemethodbywhichwecancreateArrayinstancewiththehelpof+operator.YouallmustknowthatinthearticleswhichwererelatedtoArraycreationarePublicclassmethodsandnowinmo