Ethereum Error: Typeerror: X is not a function
As a developer working with Ethereum Smart Contracts, you are probably not unknown to the complex world of languages and libraries for programming. However, when you use certain methods of your Ethereum contract, you may encounter a mistake that seems meaningless at first glance. In this article, we will deepen the specifics of what causes this problem and provide a solution.
Problem: Typeerror: X not a function
When you try to call your Ethereum contract method using Contract.mentehods.metoname (), he casts an error stating that x is not a function. This may seem like a common error message, but in reality it is more consistent than that.
Problem: Unbound constructor
In most programming languages, including JavaScript and some other libraries, when you call an object method without specifying the object itself (ie, x), it will look for a design function defined elsewhere. In this case, however, we work with a contract, not a class.
Repair: Connect the constructor
To resolve this problem, you must bind the constructor of your contract method to a copy of the contract itself. This is done using the bind () method provided by the ‘Call.
javascript
Contract.metons.mymehethod.bind (this) .call ();
`
In this example, we bind the designer mymeton with" this "(ie the copy of our contract), which allows us to call it without indicating a 'x.
best practices
To avoid such problems in the future:
- Make sure your methods are defined as constructors (
constructor X ()) instead of regular functions.
- Use the
bind () 'method when calling a copy of the contract.
By applying these repairs and best practices, you should be able to resolve Typeerror: X is not a function of an error associated with your intelligent Ethereum contract.
Sample code
Here is an example fragment of code that demonstrates how to fix this problem:
javascript
Imports * as Ethereals from Ethers;
CONST mycontract = artifacts.require (‘MyContract’);
Contract (‘MyContract’, Async (Accounts) => {
Const Instance = Expect MyContract.new ();
Const mymeton = Instance.Memetods.mymethod;
// Call mymeton without specifying x
Console.log (waiting for mymeton ()); // Output: Error Typeerror: X not a feature
// Using Bind () to indicate this, we solve the problem:
Const Result = Expect mymeton.bind (this) .call ();
Console.log (result);
});
`
Be sure to replace “MyContract” with the actual name of your contract and change the code accordingly.
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