标签：长度 字符串 tin 常用 详解 取出 var display perl
Perl的数组操作有四大常用函数：
push：从数组的末尾加入元素。
pop ：从数组的末尾取出元素
shift： 从数组的开头取出元素
unshift：从数组的开头加入元素
1、push
#!/usr/bin/perl
use strict;
use warnings;
my @array = ();
for ( my $i = 1 ; $i <= 5 ; ++$i ) {
push @array, $i;
print "@array\n";
}
output：
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
2、pop
#!/usr/bin/perl
####<pop>###
use strict;
use warnings;
my @array = ( 1, 2, 3, 4, 5, 6 );
while (@array) {
my $firstTotal = pop(@array);
print "@array\n";
}
output：
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
3、shift
#!/usr/bin/perl
####<shift>###
use strict;
use warnings;
my @array = ( 1, 2, 3, 4, 5, 6 );
while (@array) {
my $firstTotal = shift(@array);
print "@array\n";
}
output：
2 3 4 5 6
3 4 5 6
4 5 6
5 6
6
4、unshift
#!/usr/bin/perl
####<unshift>###
use strict;
use warnings;
my @array = ();
for ( my $i = 1; $i <= 5; ++$i ) {
unshift( @array, $i ); # add $i to front of @array
print "@array\n"; # display current @array
}
output：
1
2 1
3 2 1
4 3 2 1
5 4 3 2 1
另外，perl的数组还有其它重要函数，如splice、subtr、split、join、sort等:
5、splice 操作数组中间部分的函数：
5.1、向数组中间插入内容
#!/usr/bin/perl
use strict;
use warnings;
my @array = ( 0 .. 6 );
my @array1 = ( ‘a‘ .. ‘d‘ );
my @replaced = splice( @array, 3, 2, @array1 );
print "replaced: @replaced\n",
"with: @array1\n",
"resulting in: @array\n\n";
output：
replaced: 3 4
with: a b c d
resulting in: 0 1 2 a b c d 5 6
5.2、删除数组元素
#!/usr/bin/perl
use strict;
use warnings;
my @array = ( 0 .. 6 );
my @array1 = ( ‘a‘ .. ‘d‘ );
my @replaced = splice( @array, 3, 2 );
print "replaced: @replaced\n",
"resulting in: @array\n\n";
output：
replaced: 3 4
with: a b c d
resulting in: 0 1 2 5 6
删除到末尾
#!/usr/bin/perl
use strict;
use warnings;
my @array = ( 0 .. 6 );
my @array1 = ( ‘a‘ .. ‘d‘ );
my @replaced = splice( @array, 3 );
print "replaced: @replaced\n",
"resulting in: @array\n\n";
output：
replaced: 3 4 5 6
resulting in: 0 1 2
6、join 连接列表中的各个分离的串，生成一个新的串，返回一个标量！
#!/usr/bin/perl
use strict;
use warnings;
my @array = ( 0 .. 6 );
my $replaced = join("\n", @array);
print "$replaced\n",
output：
0
1
2
3
4
5
6
7、split
把字符串进行分割并把分割后的结果放入数组中
perl -le ‘$p=q(/var/ftp/test);@a=split(/\/ftp\//,$p);print $a[1];‘
test
perl -le ‘$p=q(/var/ftp/test);@a=split(/\/ftp\//,$p);print $a[0];‘
/var
8、scalar
统计数组的长度，一般我们不用这个，直接将数组赋值给标量即可。
#!/usr/bin/perl
use strict;
use warnings;
my @array = ( 0 .. 6 );
my $count1 = @array;
my $count2 = scalar @array;
print "$count1\n";
print "$count2\n";
output：
7
7
9、sort
对数组元素进行排序
#!/usr/bin/perl
use strict;
use warnings;
my @array = ( 0 .. 9 );
my @reversed = reverse @array;
print "Original: @array\n";
print "Reversed: @reversed\n\n";
# create an unsorted array of numbers and sort it
my @array2 = ( 100, 23, 9, 75, 5, 10, 2, 50, 7, 96, 1, 40 );
my @sortedLexically = sort @array2;
my @sortedNumerically = sort { $a <=> $b } @array2;
print "Unsorted: @array2\n";
print "Lexically: @sortedLexically\n";
print "Numerically: @sortedNumerically\n";
output：
Original: 0 1 2 3 4 5 6 7 8 9
Reversed: 9 8 7 6 5 4 3 2 1 0
Unsorted: 100 23 9 75 5 10 2 50 7 96 1 40
Lexically: 1 10 100 2 23 40 5 50 7 75 9 96
Numerically: 1 2 5 7 9 10 23 40 50 75 96 100
Perl 数组应用详解(push, pop, shift, unshift)
标签：长度 字符串 tin 常用 详解 取出 var display perl
原文地址：https://www.cnblogs.com/qiyuexin/p/8824381.html
