Ethereum Contract Implementation Error: Argument cannot be passed
As an Ethereum developer, you are not the only one who encounters this issue. In this article, we will explore the reasons behind the error “TypeError: unsupported addressable value” when implementing a contract with parameters.
What is happening in your code?
Let’s take a closer look at the unit test code:
const args = [/ some arguments /];
const certification = new Certification(args);
In this case, the `args'' array contains multiple values (e.g. addresses, strings, or other Ethereum objects). However, when you pass these arguments to thenew Certification(args)constructor, it tries to create an instance of theCertificationcontract using the&operator, which is not a valid way to pass arguments in JavaScript.
Why is this error occurring?
The reason for this error lies in the way Ethereum contracts work. When you call a function in a smart contract, such as "Certification", it expects a single argument: the address of the instance object that will receive the result. By using the&operator with multiple arguments (for example,[ “address” ]), you are passing an array of values to the contract, which is not valid.
What can you do to fix this issue?
To fix this error, you need to pass a single argument to the contract instead of an array. Here are some possible solutions:
1. Pass a single parameter
Instead of using&with multiple arguments, simply pass a single value:
const args = [/ a value /];
const certification = new Certification(args);
This should fix the problem.
2. Use JSON.stringify() to convert values to strings
If you are passing a value that can be converted to a string using JSON.stringify()`, you can pass it as a string:
const args = [JSON.stringify({ / a value / })];
// or
const args = [/ a value /];
This is because JSON objects are serializable, so any value with properties like an “address” field will be converted to a string.
3. Wrap the argument in an object
Another possible solution is to wrap the argument in an object:
const args = { address: "some_address"};
const certification = new Certification(args);
This creates a new object with a single property, which can be passed as a single value.
Conclusion
In conclusion, when implementing contracts with parameters, it is essential to pass the correct argument format. By using “&” with multiple arguments or encapsulating values in an object, you should be able to resolve the “TypeError: unsupported addressable value” error and successfully deploy the contract.
Remember to always test your code thoroughly to ensure that issues are resolved before deploying your contracts to the Ethereum blockchain. Happy coding!