Back-End Programming Exam > Back-End Programming Videos > Perl Building Blocks: An Introduction to Perl > Perl Tutorial - 11: Converting Strings to Arrays
Perl Tutorial - 11: Converting Strings to Arrays Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
FAQs on Perl Tutorial - 11: Converting Strings to Arrays Video Lecture - Perl Building Blocks: An Introduction to Perl - Back-End Programming
| 1. How do I convert a string to an array in Perl? |  |
Ans. To convert a string to an array in Perl, you can use the split() function. This function allows you to split a string into an array based on a delimiter. Here's an example:
```perl
my $string = "Hello,World";
my @array = split(',', $string);
```
In this example, the split() function splits the string `$string` at every comma ','. The resulting array `@array` will contain two elements: "Hello" and "World".
| 2. Can I convert a string to an array without specifying a delimiter in Perl? | |
Ans. Yes, you can convert a string to an array without specifying a delimiter in Perl. In such cases, each character of the string will be treated as a separate element in the resulting array. Here's an example:
```perl
my $string = "Hello";
my @array = split('', $string);
```
In this example, the split() function splits the string `$string` at every character. The resulting array `@array` will contain five elements: "H", "e", "l", "l", and "o".
| 3. How can I convert a string to an array in Perl while preserving whitespaces? | |
Ans. By default, the split() function in Perl removes leading and trailing whitespaces when splitting a string into an array. To preserve whitespaces, you can modify the split() function to include a regular expression that captures whitespaces. Here's an example:
```perl
my $string = "Hello World";
my @array = split(/(\s+)/, $string);
```
In this example, the split() function splits the string `$string` at every whitespace character '\s+'. By enclosing the whitespace character in parentheses, it is captured and included as a separate element in the resulting array `@array`. The resulting array will contain seven elements: "Hello", " ", "World".
| 4. Can I convert a string to an array based on a pattern match in Perl? | |
Ans. Yes, you can convert a string to an array based on a pattern match in Perl. Instead of specifying a delimiter, you can provide a regular expression pattern as the first argument to the split() function. The function will split the string at every occurrence of the pattern. Here's an example:
```perl
my $string = "apple,banana,grape,orange";
my @array = split(/,/, $string);
```
In this example, the split() function splits the string `$string` at every comma ','. The resulting array `@array` will contain four elements: "apple", "banana", "grape", and "orange".
| 5. How can I convert a string to an array in Perl while limiting the number of resulting elements? | |
Ans. To limit the number of resulting elements when converting a string to an array in Perl, you can provide a third argument to the split() function. This argument specifies the maximum number of elements to be generated. Here's an example:
```perl
my $string = "1,2,3,4,5";
my @array = split(/,/, $string, 3);
```
In this example, the split() function splits the string `$string` at every comma ',' and generates a maximum of three elements. The resulting array `@array` will contain three elements: "1", "2", and "3". The remaining elements "4" and "5" will not be included in the array.
Text Transcript from Video
hello guys welcome to my channel this is
the eleventh tutorial in this course and
in this tutorial we are going to see how
we can change a string to an array in
Perl so in the last tutorial we saw how
we can use the join method or the join
subroutine to convert the an array to a
string and in this video we are going to
see how we can use the split method or
the split subroutine to do the exact
opposite thing that is convert a string
to an array variable so we're going to
work with the script that's called
string underscore - array and in this
script on line number five I have
created a scalar string variable called
my underscore string and it has a text
all work and no play makes Jack a dull
boy right and if you remember in the
last script we created the in a rave
variable first and it was called
instruments and we're going to just do
the reverse thing in this tutorial so on
line number seven I have created an
array variable I've called it my
underscore array and I have made a call
to the split subroutine and this
function like the join method accepts
two arguments the second argument is the
string variable from which you want your
array to be created and the first
argument is a delimiter and it has to be
a string so this delimiter is the
character where you want a / to chop
your string so if suppose you want all
the different words in your string to be
individual array elements in that case
you would have to use the space as the
delimiter or the space as the character
on which you want the string to be split
so that is what I want so that's why I
passed a space character as the first
argument to this function and then on
line number nine I have a print
statement that is going to display the
the contents of my array and just to
make short weather draw this is actually
an array and it has been created
properly we just want to slice the first
you know five elements from this array
all work and no play you know just to
you know have a feel of working with
arrays so I have saved this file already
I just have to run it by pressing f5 so
there we go we first see all work and no
play makes Jack a dull boy we see all
the elements in this array and we will
not be able to tell by just looking at
this output whether this is a string or
an array so that's why I have the other
print statement on line number ten which
is only going to display part of this
array the first five elements and
remember I have this because of the two
dots between 0 and 4 so Perl is going to
autofill one two and three and it's also
going to put the commas for the slicing
to be done so that's it for this
tutorial I'm going to see you in the
next video I hope you had fun watching
this one you may subscribe to my channel
if you haven't already in the next
tutorial we are going to wrap up our
discussion on arrays and then we are
going to move on to other Perl concepts
we're probably going to you know start
our discussion on hashes so that's it
for the time being
take care and I'll see you in the next
video
the eleventh tutorial in this course and
in this tutorial we are going to see how
we can change a string to an array in
Perl so in the last tutorial we saw how
we can use the join method or the join
subroutine to convert the an array to a
string and in this video we are going to
see how we can use the split method or
the split subroutine to do the exact
opposite thing that is convert a string
to an array variable so we're going to
work with the script that's called
string underscore - array and in this
script on line number five I have
created a scalar string variable called
my underscore string and it has a text
all work and no play makes Jack a dull
boy right and if you remember in the
last script we created the in a rave
variable first and it was called
instruments and we're going to just do
the reverse thing in this tutorial so on
line number seven I have created an
array variable I've called it my
underscore array and I have made a call
to the split subroutine and this
function like the join method accepts
two arguments the second argument is the
string variable from which you want your
array to be created and the first
argument is a delimiter and it has to be
a string so this delimiter is the
character where you want a / to chop
your string so if suppose you want all
the different words in your string to be
individual array elements in that case
you would have to use the space as the
delimiter or the space as the character
on which you want the string to be split
so that is what I want so that's why I
passed a space character as the first
argument to this function and then on
line number nine I have a print
statement that is going to display the
the contents of my array and just to
make short weather draw this is actually
an array and it has been created
properly we just want to slice the first
you know five elements from this array
all work and no play you know just to
you know have a feel of working with
arrays so I have saved this file already
I just have to run it by pressing f5 so
there we go we first see all work and no
play makes Jack a dull boy we see all
the elements in this array and we will
not be able to tell by just looking at
this output whether this is a string or
an array so that's why I have the other
print statement on line number ten which
is only going to display part of this
array the first five elements and
remember I have this because of the two
dots between 0 and 4 so Perl is going to
autofill one two and three and it's also
going to put the commas for the slicing
to be done so that's it for this
tutorial I'm going to see you in the
next video I hope you had fun watching
this one you may subscribe to my channel
if you haven't already in the next
tutorial we are going to wrap up our
discussion on arrays and then we are
going to move on to other Perl concepts
we're probably going to you know start
our discussion on hashes so that's it
for the time being
take care and I'll see you in the next
video
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Nov 22, 2024 Last updated |
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