Asides from the several built-in data types Julia offers like string, integer, etc., Julia gives a programmer the ability to create their own data type using a type called
struct. This helps us organize data to our specific needs.
A struct in Julia is a composite data type that allows you to store multiple values in a single object. Structs are similar to classes in object-oriented programming languages but are simpler and more lightweight. Structs are useful for organizing related data into a single object, and for creating data types with custom behavior.
Structs are immutable by default; after being created, an instance of one of these types cannot be changed. To declare a type whose instances can be changed, the
mutable struct keyword can be used instead.
To define a struct, the
struct keyword is used. Here is the basic syntax for defining a struct:
struct MyStruct field1::Type1 field2::Type2 end
MyStructis the name of the struct and
field2 are the names of the fields of the struct.
Type2 are the types of the corresponding fields.
For example, let's define a simple struct
Person with three fields
struct Person name::String age::Int phone_number::Int64 end
This defines a
Person struct with three fields:
name of type
age of type
phone_number of type
You can create a new instance of the
Person struct as follows:
p = Person("John Doe", 30, 1234567890)
This creates a new
Person object with the name "John Doe" of age 30 and a phone number of 1234567890.
The values of the fields can be accessed using the
dot notation, like this:
println(p.name) println(p.age) println(p.phone_number)
The following code above returns the value of the fields, “John Doe”, 30, and 1234567890 respectively.
Structs are a great way to organize complex data in Julia. They allow you to store related data in a single object and provide custom behavior for your data types. Structs are also lightweight and more efficient than classes, making them faster and easier to use. Finally, structs are a great way to make your code easier to read and understand, as they make it clear which data belongs to which object.
Structs in Julia are a powerful tool for creating custom data types that can help you organize and manipulate data in a way that makes sense for your specific use case. Whether you are working on a small personal project or a large-scale application, structs can help you get the job done quickly and efficiently.