co-try-catch
v0.5.0
Published
go-lang-style error handling using co library
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co-try-catch
Provides a nicer way to handle errors avoiding ugly native try {} catch (e) {}
indentation.
Example
const { tryCatch } = require('co-try-catch');
function *getData() {
const response = yield tryCatch(makeAsyncRequest(options));
if (response.failed()) {
/* handle error */
return /* and stop function execution */;
}
/* continue with the normal function execution */
console.log(response.getResult());
}
...also, if you prefer...
const { err, result } = yield tryCatch(makeAsyncRequest(options));
Api
*tryCatch(gen: Function|Function*|Promise): TryCatchResult
TryCatchResult
isError(): Boolean
Returns if function has thrown an error
isSuccess(): Boolean
Returns if function didn't throw an error
failed(): Boolean
alias of isError()
succeeded(): Boolean
alias of isSuccess()
getError(): Mixed
Returns the thrown object
getResult(): Mixed
Returns result of the function execution
Supports nested calls
if a function call returns an instance of TryCatchResult
it is passed up to the caller
const { tryCatch } = require('co-try-catch');
co(function*() {
const exception = function *() { thrown new Error('test'); }
const fn1 = function *() { return yield tryCatch(exception()); };
const fn2 = function *() { return yield tryCatch(fn1)); };
const result = tryCatch(f2());
result.isError().should.equals(true);
result.getError().message.should.equals('test');
});