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Michael Fawole is a Blockchain and web application developer with 7+ years of experience and 3+ years plus of experience in blockchain dapp development.
He is also delivering training on blockchain ( Solidity, web3 and react js ) and php language.
He also helps start-ups and companies to setup blockchain practice and incorporating blockchain into existing project.
Techstack (Blockchain): Solidity, web3 js and react js. Techstack (Webapp): Php and Mysql.
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In this article, I will be explaining explicitly what we call array struct in solidity and how they work in solidity coding.
Before we talk about array-struct, you should know what array is and what struct is.
An array is a data structure which saves collections of elements of the same data type.
Let take it one by one.
uint[3] public learn = [1,2,3];
uint is the data type while the square bracket that has 3 inside is the fixed array telling us that the size of the array is 3, "public" is the visibility qualifier while learn is the name of the variable holding the array.
2 Dynamic array is an array whose size is unlimited. For example
uint[] public learn = [1,2,3];
In fixed array we specified the array size but in dynamic array, you leave the bracket empty.
Structs in Solidity enables us to create more complicated data types that have multiple properties.
To write struct in solidity you start with struct, then you mention the name of the struct, followed by curly bracket.
For example
struct web3Africa{
}
Next is to fill the struct with details like name, age and height.
struct web3Africa{
string name;
uint age;
uint height;
}
name variable type is string while that of age and height is uint.
Numbers are given uint while alphabet or alphanumric are string.
Array struct is the combination of struct and array.
The formula for array struct is given below
struct-name[] public name-of-array;
Let now apply the struct name and give the array any name we want.
web3Africa[] public intel;
Let see the full code
pragma solidity ^0.5.0;
contract Michael{
struct web3Africa{
string name;
uint age;
}
web3Africa[] public intel;
}
Congratulations, you have learnt array struct in solidity.