5 ms·

In short, they provide clean API for checking on completion and error states of a long-running process from another thread without blocking that thread. This is

• Jtsummers 5y ago
  Fair enough, I think we are thinking of futures slightly differently. I was thinking primarily about the deferred action to get a result (in which case channels and goroutines are equivalent with a select to handle, perhaps, an error result). You're also thinking of the other capabilities around task management and monitoring which I was not.
  • phamilton 5y ago
    An easy example of where having promises is nice: a := getFoo() b := getBar() c := getBaz() If you want to do all 3 in parallel, you may need to use channels and wait groups and stuff. In a language with promises: const a = getFoo(); const b = getBar(); const c = getBaz(); await a await b await c or even better const [a,b,c] = await Promise.all([getFoo(), getBar(), getBaz()]) If/when go generics become available, I expect to see some libraries that make things easier in golang.
• kevingadd 5y ago
  This is built into the .NET API though? You can just check the Faulted and Completed properties of the Task you're holding.
  • Jenk 5y ago
    GP wants those to be part of the Go stdlib.