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0x packages are promise-based libraries. This means that whenever an asynchronous call is required, the library method will return a native Javascript promise. You can therefore choose between using `promise` or `async/await` syntax when calling our async methods.
_Async/await syntax (recommended):_
```javascript
try {
const signature = await signatureUtils.ecSignOrderHashAsync(
providerEngine,
orderHashHex,
maker,
SignerType.Default,
);
} catch (error) {
console.log('Caught error: ', error);
}
```
_Promise syntax:_
```javascript
signature = signatureUtils
.ecSignOrderHashAsync(providerEngine, orderHashHex, maker, SignerType.Default)
.then(function(signature) {
console.log(signature);
})
.catch(function(error) {
console.log('Caught error: ', error);
});
```
As is the convention with promise-based libraries, if an error occurs, it is thrown. It is the callers responsibility to catch thrown errors and to handle them appropriately.
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