Strings (Basics of Memory) | Godot GDScript Tutorial | Ep 10.2
Summary
TLDRThis episode of the GT script fundamental tutorial series delves into the intricacies of strings in programming. It explains how strings are stored in memory, behaving similarly to arrays with indexed characters. The tutorial covers string methods such as insert, length, and split, demonstrating their use with practical examples. The presenter also emphasizes the difference in memory allocation between strings and arrays, and encourages viewers to explore the GD script API documentation for more string functionalities.
Takeaways
- đ A string in GT script is a sequence of characters enclosed in double quotes, considered a literal string value.
- đ§ Strings are stored in memory similarly to arrays, with each character at a specific consecutive memory address.
- đą Strings have indexes, with the first character at index 0 and the last at the highest index, which is the length of the string minus one.
- đ You can loop through a string variable to access each character individually.
- đ Strings in GT script come with various methods, such as 'insert', 'length', and 'split', which can manipulate and retrieve information about the string.
- đ„ The 'insert' method allows you to add a string at a specific index, shifting the rest of the string to the right.
- đ The 'length' method returns the number of characters in the string, which is the last index plus one.
- đ The 'split' method divides the string into an array based on a specified delimiter, but it does not split by individual characters.
- đ Assigning a string to another variable does not point to the same memory address; changes to one do not affect the other.
- đ Demonstrated in the script is how to loop through a string, use its methods, and manipulate its content with examples.
- đ The GT script API documentation on the Godot Engine website provides more information on the available string methods and their usage.
Q & A
What is a string in the context of the GT script tutorial?
-A string in the GT script tutorial refers to any value contained inside double quotations, which is called a literal string value.
How are strings stored in memory according to the tutorial?
-Strings are stored in memory with each character stored at a specific, consecutive memory address, similar to an array, but without the ability to call certain functions as you would with an array.
What is the significance of indexes in strings?
-Indexes in strings are used to access specific characters within the string. The first character is at index 0, and the last character is at the last index position.
Can you loop through a string variable in GT script?
-Yes, you can loop through a string variable in GT script, allowing you to print out or manipulate each character individually.
What is the purpose of the 'insert' method in strings?
-The 'insert' method is used to insert a string value into a specific index position within the string, pushing everything else to the right.
What does the 'length' method return for a string?
-The 'length' method returns an integer value representing the length of the string, which is the last index position plus one.
How does the 'split' method work in strings?
-The 'split' method splits a string into an array based on a specified delimiter. It does not split strings by character but uses a delimiter to separate the string into multiple values.
Why might you use a for loop to split a string by its characters?
-A for loop is used to split a string by its characters because the 'split' method requires a delimiter and cannot split the string by each individual character without one.
How does assigning a string value to a new variable affect the original string in memory?
-Assigning a string value to a new variable does not change the value of the original string unless the new variable is modified, as strings are not passed by reference but by value.
Where can I find more information about string methods in GT script?
-You can find more information about string methods in the GD script API documentation on the Godot Engine website.
Outlines
đ Introduction to Strings in GDScript
This paragraph introduces the concept of strings in GDScript, explaining that a string is any sequence of characters enclosed in double quotes. It delves into how strings are stored in memory, similar to arrays but with unique behaviors. The paragraph discusses the sequential storage of characters in memory addresses, the use of indexes to access characters, and the ability to loop through a string to print each character individually. It also touches on the methods available for strings, such as 'insert' to add characters at a specific index and 'length' to determine the number of characters. Additionally, it mentions the 'split' method, which requires a delimiter to divide a string into an array of substrings.
đ§ Practical String Manipulation in GDScript
This paragraph provides a practical demonstration of string manipulation in GDScript through code examples. It starts by showing the assignment of a string literal to a variable and the creation of a second variable to illustrate that strings are not passed by reference, meaning changes to one variable do not affect the other. The paragraph continues with a detailed explanation of looping through a string using a for loop, utilizing the 'length' and 'split' methods, and the 'insert' method to add a new substring at a specified index. The code snippet concludes with an example of inserting a new string at the beginning of an existing string and printing the result to demonstrate the updated string value. The paragraph concludes by encouraging viewers to explore the GDScript API documentation for more string methods and functionalities.
đ Closing Remarks and Acknowledgments
The final paragraph serves as a closing to the tutorial, thanking the viewers for joining the episode, liking the video, and subscribing for more content. The host expresses anticipation for the next episode and wishes the viewers an amazing day, emphasizing a positive and engaging conclusion to the video script.
Mindmap
Keywords
đĄString
đĄLiteral String Value
đĄMemory Address
đĄIndex
đĄLoop
đĄInsert Method
đĄLength Method
đĄSplit Method
đĄDelimiter
đĄGDScript
đĄAPI Documentation
Highlights
A string is any value contained inside double quotations, referred to as a literal string value.
Strings behave like objects in memory addresses, similar to arrays, with characters stored at specific memory addresses consecutively.
Strings have indexes, with the first character at index 0 and the last character at the final index position.
You can loop through a string variable, printing each character individually.
Strings allow indexing, enabling access to specific characters using square brackets and an index position.
The insert method allows inserting a string value at a specific index position in the string, shifting other characters to the right.
The length method returns an integer representing the length of the string.
The split method requires a delimiter to split the string, returning an array of the resulting substrings.
Strings cannot be split by character using the split method; a for loop is recommended for this purpose.
Assigning a string variable to another variable does not point to the same memory address, unlike arrays.
Looping through a string using a for loop allows performing actions on each character.
String methods in GD Script, such as length and split, provide powerful ways to manipulate string data.
The length method example shows how it returns the value 6 for the string 'string'.
The split method example illustrates splitting a string with an empty delimiter, resulting in an array of length 1 containing the entire string.
The insert method example demonstrates inserting 'new ' at index position 0, changing 'string' to 'new string'.
Strings in GD Script come with various methods provided in the string object, detailed in the GD Script API documentation on the Godot Engine website.
Transcripts
hello and welcome to another episode in
the GT script fundamental tutorial
series in this episode we'll be taking a
quick look at strings so basically a
string is any value contained inside
double quotations anything inside double
quotations is called a literal string
value however I wanted to go just a
little deep into how strings are stored
in memory address strings behave like an
object in memory address almost similar
to an array the only difference is you
can't call certain functions in a string
like you would in a ray but they are
similar a string value has a character a
single character stored at a specific
memory address and in memory address
they are consecutively stored in memory
so basically in our address our capital
S is at 20 RTS and 21 and we just keep
going in order almost like an array and
on top of that they do have indexes for
example the first character in your
string value is that index 0 and the
last value is at the last index position
in this case 5 one thing you may not
have known is that you can loop your
string variable so in this case for
string value has the word string we can
loop it for example for every character
in our string value print out that
character and it will print individually
each individual character inside our
string value on top of that just like
arrays because strings behave almost
like arrays we can indicate an index
position in our string value for example
if we want the first letter of our
string we just do string value square
brackets with the index position in this
case we're using 0 so the first position
in our string which is the capital S
string values come with a lot of methods
however I just wanted to go over a few
you may use in your programming journey
first is the insert method so you get
your string object followed by the dot
notation followed by the insert method
the first argument is the index position
and the second argument is a string
value basically what you're doing is
you're inserting the string value into
the index position and then pushing
everything else to the right
next you have the length method and just
like an array it will return back the
value and just like an array will return
back a literal integer value that
represents the length of your string in
this case our string will always be the
last index position plus one so in this
case we will get back to six and lastly
you may want to split your strings keep
in mind the split method cannot split
your strings by character you do have to
declare a delimiter for example if your
string values are separated by commas
you can use the comma character as your
delimiter and you will split your string
by that delimiter and return back an
array containing your new values however
if you want to split a string by its
character it's best to use a for loop
now let's go ahead and take a look at
some code as you can see here on our
first line of code we have a variable
called string value and it is assigned a
literal string value with the word
string I've also created a second
variable test basically this line to
show you that even when we assign our
string value to tests we are not
pointing to the same memory address
location I mean I want to show that even
though we point to the same value if we
were to change tests we will not change
the value inside string value unlike an
array now in our ready function you can
see here in our first line we are
looping through our string value for
character in string value however just
note that you can loop through strings
and your for loop and as you can see
here we're using some methods provided
to us in our string object the length
method will return back 6 our split
method and our delimiter is nothing so
that just basically returns everything
back into the index position 1 or rather
0 the index position 0 to our string
variable so our variable will contain an
array of length 1 containing our entire
string value and lastly we are inserting
a string into our variable string insert
and basically what we're saying is
insert the new string value new with a
space and insert that into index
position 0 so now our
in value which is string will now say
new string or new space string and over
here we print that out to screen so you
can see what the new values consist of
and what they look like strings are
quite complex but pretty straightforward
once you figure out how they behave in
memory and how you're able to use
methods provided to you with the string
object in GT script the string object
comes with a lot of options provided to
you so feel free to check that out in
the GD script API documentation on the
Godot Engine website that's all I have
for you in this episode thank you for
joining me thank you for clicking the
like button thank you for subscribing I
look forward to seeing you in the next
episode have an amazing day
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