A Perl array variable stores an ordered list of scalar values.
To refer a single element of Perl array, variable name will be preceded with dollar ($) sign followed by index of element in the square bracket.
Perl Simple Array Example
This is a simple example to use Perl array.
2015 2016 2017 One Two Three
In the above example, we have defined two arrays, one with number element and other with string element. Both arrays are printed with their index elements.
Perl Array Accessing
To access a single element of a Perl array, use ($) sign before variable name. You can assume that $ sign represents singular value and @ sign represents plural values.
Variable name will be followed by square brackets with index number inside it. Indexing will start with 0 from left side and with -1 from right side.
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Perl Array Size or Length
The size of an array is determined with scalar context on the array. The returned value will be always one greater than the largest index. In short the size of an array will be ($#array + 1). Here, $#array is the maximum index of the array.
Size: 6 Maximum Index: 5
In the output, there are only three elements containing information, but the give array has total 5 elements.
Perl Array Functions
You can add or remove an element from an array using some array functions.
We'll discuss following array Perl functions:
1) Push on Array
The push array function appends a new element at the end of the array.
pink red blue orange
In the above program, "orange" element is added at the end of the array.
2) Pop on Array
The pop array function removes the last element from the array.
In the above program, "blue" element is removed from the end of the array.
3) Shift on Array
The shift array function removes the left most element of array and thus shorten the array by 1.
In the above program, "pink" is removed from the array.
4) Unshift on Array
The unshift array function adds a new element at the start of the array.
orange pink red blue
In the above program, "orange" is added at the start of the array.
Perl Replacing Array Elements, splice()
The splice array function removes the elements as defined and replaces them with the given list.
Before - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z After - A B C D E F G H U V W X Y Z Q R S T U V W X Y Z
In the above program, the replacement begins counting from 9th position (I) to 8 elements that is P.
Perl Strings to Arrays, split()
With the help of split() function, we can split a string into array of strings and returns it.
In the above program, we have transformed $string into array at hyphen (-) values. Now from this array, we have printed fourth element of the array.
Perl Arrays to Strings, join()
The join() function is used to combine arrays to make a string. It combines the separate arrays into one string and returns it.
In the above program, the string is splitted at hyphens (-). We have used join() in $string_full and printed it.
Perl Merging Two Arrays, merged()
Two arrays can be merged together using merged() function as a single string removing all the commas in between them.
Girl in front of me is very beautiful
In the above program, array1 and array2 are merged into one single string and then printed.
Perl Sorting Arrays, sort()
To sort an array, sort() array function is used. The sort() function sorts all the elements of an array according to the ASCII standard.
Original array: sun mon tue wed thu fri sat Sorted array: fri mon sat sun thu tue wed
In the above program, we have printed both original and sorted array. This array is sorted in the alphabetical order.