Perl's original designer was Larry Wall (Larry Wall), which was published on December 18, 1987. Perl borrows the features of C, sed, awk, shell scripting, and many other programming languages. Larry Wall Published version 1.0 of the Perl scripting
one. DataType (data type ):Perl's data types are roughly four: Scalar (variables), Scalar Array (array), hash array (hash), References (pointer), but they seem to be small but more than sufficient. In particular, you can write a Perl program without
I. Data Types(Data type):
Perl has four data types: Scalar (variable), Scalar Array (Array), Hash Array (Hash), and References (pointer ), it seems to be rare, but it is more than enough to use it. Especially when writing Perl programs, you do not
1. List and array. The list mentioned in this book is a data structure. array is the data type used to store the list in Perl. In most cases, these two words can be exchanged, meaning the same. Unlike C, the Perl array does not need to define the
A list is a sequence of values enclosed in parentheses that can be any value or NULL, such as: (1, 5.3, "Hello", 2), empty list: ().Note: A list containing only one numeric value (for example: (43.2)) is different from the value itself
The previous article lists the similarities and differences between the ways of objects and JS in Perl. This continues to complement the array, the hash of the associated operation.
You can add additions and deletions to the array.
One: Python vs. Perl(1) The initial purpose of designing a language determines what features the language will be built in:Perl was originally created for the formatting of text, so the built-in regular, Python built a complex type, guess Guido
All numbers have the same format internally in prel. In fact the Perl use double-precision floating-point value to store numbers.
Creating charaters by code point: CHR (), and ord () metheds.
$alef = chr(0x05df) ;$code_point = ord('d') ;
A Perl application database uses the DBM package configured by itself to create and operate a database, therefore, the DBM package and other similar packages can be considered as a database extension. The other is to use the DBI package or similar
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