注意：pop() 方法将删除 arrayObject 的最后一个元素，把数组长度减 1，并且返回它删除的元素的值。如...
$array[0] = a; Sets the first element of @array to a @array[3..5] Array slice - returns a list containing the 3rd thru 5th elements of @array scalar(@array) Returns the number of elements in @array $#array The index of the last element in @array grep(/pattern/, @array) Return...
my @sub_array = @array[1..3]; 添加元素到数组: 可以使用push方法将元素添加到数组的末尾: 代码语言:txt 复制 push @array, 5; 从数组中删除元素: 可以使用pop方法从数组末尾删除元素,并返回被删除的元素: 代码语言:txt 复制 my $last_element = pop @array; 数组排序: 可以使用sort函数对数组进行排序:...
数组array则是存储列表的变量。数组/列表的每个元素element都是单独的标量变量,拥有独立的标量值。 1. 数组: 访问数组中的元素: $fred[0]="yaya";$fred[1]="yaya1";$fred[2]="yaya" ... $fred[99]=“last" 特殊的数组索引:$#fredfred数组最后一个索引值; fred[$#fred] ="last" $fred[-1] ="...
= @coins\n"; # add one element at the end of the array push(@coins, "Penny"); print "2. \@coins = @coins\n"; # add one element at the beginning of the array unshift(@coins, "Dollar"); print "3. \@coins = @coins\n"; # remove one element from the last of the array....
# add one element at the end of the array push(@coins, "Penny"); print "2.\@coins =@coins\n"; # add one element at the beginning of the array unshift(@coins, "Dollar"); print "3.\@coins =@coins\n"; # remove one element from the last of the array. ...
exists argument is a HASH or ARRAY element,exists操作的对象需要是一个hash或者array元素。 判断一个hash中的键是否存在,键存在但有可能是undef。在hash中,当检验一个元素值是否被定义赋值是用defined,当检验一个key在hash中是否存在时,用exists(即使该键下的值不存在)...
复制代码 foreach循环(用于遍历数组或列表): my @array = (1, 2, 3, 4, 5); foreach my $element (@array) { print $element, "\n"; } 复制代码 除了以上常见的循环结构之外,Perl还提供了更多的循环控制语句和模块,如last、next、redo等,可以根据具体的需求选择合适的循环结构。 0 赞 0 踩...
Perl'sshift()function is used to remove and return the first element from an array, which reduces the number of elements by one. Thefirst elementin the array is the one with the lowest index. It's easy to confuse this function withpop(), which removes thelastelement from an array. ...
In Perl, arrays are represented by an @ before the variable, but in Option 2 above, we use a $# prefix, which accesses the index of the last element of an array. We use $# in Option 4 but use the keyword scalar in Option 3. The scalar keyword returns the number of elements in...