perl array operate_arrayoperate-优快云博客

本文介绍了Perl中数组的基本操作，包括索引访问、长度查询、元素增删、字符串转换及排序等。并详细解释了如何使用特定语法实现这些功能。

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1.array indexing:
       $array[0] # the first element.
       $array[1] # the second element.
       $array[-1] # the last element.
       $array[-2] # the 2nd to last element.

2. sequential number array
       @array[1 .. 100];
       @array["a" .. "z"]
3. finding the length of an array
       scalar ( @array );
       $len = @array;
4. adding and removing an element
       push @array , $element; --> add an element to the end of an array
       $element = pop @array ; --> remove the last element of an array
       unshift @array , $element ; --> add an element to the begining of an array
       $element = shift @array; --> remove the first element of an array
        delete @array[$index]--> remove an element by index number
5. split a string to array and join an array into a string
    split /pattern/, string, @array --> split the string into a string list and return the list.
    join $exp , @array --> join the sperated strings of @array into a new string with field sperated by
                                             the value of $exp, and return the new string .
6. sort an array
    sort @array;
7. foreach $element (@array);