Solana: what arguments are passed in the accounts method in program.methods.”MyProgramInstructions”().accounts({?}).instructions()

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Understanding the “Accounts” Method in Solana Guidelines

The “accounts” method is a key part of the Solana program manual, used to define the accounts that a program accesses. In this article, we’ll take a closer look at the arguments passed to the “accounts” method and explore its application in the context of your decentralized application.

What are accounts?

In Solana, an account is a unique identifier for a specific slot on the blockchain. It represents a place on the ledger where a program can store or access data. The accounts method allows these accounts to be defined as part of the program manual.

Arguments of the accounts method

When calling the accounts method, you must pass an object with the following structure:

{
[accountSlot: number]: {
type: string,
...LiteralInterface,
}
}

Here is an analysis of each argument:

  • accountSlot

    : The unique identifier of the account slot. The range is from “0” to “1023”, which is the maximum number of slots available in the Solana blockchain.

  • type: The data type of the value stored in the account slot. This can be one of the following:

+ “u8”.

+ “u16”.

+ “u32”.

+ “u64”.

+ “u128”.

+ “i32”.

+ “i64”.

  • …interfaceLiteral: Additional properties defining the interface for the account type. This is optional and can be used to define custom types or interfaces.

Example: Defining an account

Consider a simple example where we want to store a boolean value in a slot:

import {accounts} from '../programInstructions';
program constant = {
accounts,
};
accounts ({
[0]: {
type: 'u8',
value: false, // Store a boolean value in this account space
},
}).instructions();

In this example, we define an accounts object with a single account block at index 0. We specify the type as u8, meaning that the value will be stored in a boolean type. The value is then set to “false”.

Testing and Debugging

When testing a program, you can use the accounts method to access running accounts. Here’s an example:

import {accounts} from './programInstructions';
const account1 = accounts[0];
console.log(account1.type); // Output: u8
number1.value = true;
console.log(account1.value); // Output: 1 (true in TypeScript)

In this example, we access the first account slot and print its type. Then, we change the value of the given account slot to “true” and print the updated value.

Conclusion

The accounts method is a powerful tool for defining accounts in Solana programs. By understanding the arguments passed to this method, you can create complex programming instructions that interact with the blockchain. In the context of your decentralized application, you will most likely need to use this method to define different accounts and access their values ​​as part of your program logic.

Recommended reading

For more information on the Solana program structs, including the accounts method, I recommend checking out the official Solana documentation: <

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