5 ms·

Ivy big number calculator for iOS, © 2015 the Go Authors, sold by Google, Inc

14 points by gldnspud 11y ago

gldnspud 11y ago
I found this via http://9to5mac.com/2015/07/10/google-ivy-experimental-big-number-calculator/ http://9to5mac.com/2015/07/10/google-ivy-experimental-big-nu.... That article speculated that it's a "companion tool for the [Go Programming Language] project". I couldn't find any other references to iOS apps written using Go, so I'm going to speculate that Ivy itself was written in Go. :-)
- akhilcacharya 11y ago
  It's not a companion, Rob Pike wrote the Ivy package and the app was part of a demonstration that it is possible to now interop Go code and Obj-C code. https://sourcegraph.com/blog/live/gophercon2015/123653512740 https://sourcegraph.com/blog/live/gophercon2015/123653512740
minimaxir 11y ago
...for certain definitions of big. 1e100000000 causes an app lock. Also, what is going on with that app icon? Many startups nowadays have forced quirky-and-random mascots, but here it doesn't make much sense.
- coldtea 11y ago
  It's obviously a play on the Go mascot, in the same style and probably by the same artist.
- throwaway41597 11y ago
  1e100000000 would require about 41 MB [0] of storage so that's not as crazy as I thought. No idea what kind of CPU you need for anything other than an addition though. [0]: log(1eN) / log(10) = N ; therefore: bits_required = log2(1e100000000) = 100000000 * log(10) / log(2) = 3.3e8 bits = 41 MB
ctdonath 11y ago
While I understand accurate handling of big numbers is difficult, I'm surprised it's not the general norm for calculator programs/apps by now. Glad to see someone has done so (not the first, but they are rare).
akhilcacharya 11y ago
More information here - https://sourcegraph.com/blog/live/gophercon2015/123653512740 https://sourcegraph.com/blog/live/gophercon2015/123653512740 "Example of porting a Go application to mobile ivy is a command line tool developed by Rob Pike. It’s a useful desktop calculator that hangles big int, rational and floating-point numbers, vectors, matrices. It’s an interpreter for an APL-like language. It is ~5k lines of Go code (not including tests, docs). It imports math, math/big, unicode, etc. Rewriting all that in Java or Objective-C would be a lot of work and is a non-starter, since this is already just works in Go. After 2 hours, Hana had a working prorotype."
- shanemhansen 11y ago
  Hana told Rob she had written a mobile app in go in 2 hours. His response: "why did it take you 2 hours?". Classic.

14 points by gldnspud 11y ago

I found this via http://9to5mac.com/2015/07/10/google-ivy-experimental-big-number-calculator/ http://9to5mac.com/2015/07/10/google-ivy-experimental-big-nu.... That article speculated that it's a "companion tool for the [Go Programming Language] project". I couldn't find any other references to iOS apps written using Go, so I'm going to speculate that Ivy itself was written in Go. :-)

akhilcacharya 11y ago
It's not a companion, Rob Pike wrote the Ivy package and the app was part of a demonstration that it is possible to now interop Go code and Obj-C code. https://sourcegraph.com/blog/live/gophercon2015/123653512740 https://sourcegraph.com/blog/live/gophercon2015/123653512740

minimaxir 11y ago

...for certain definitions of big. 1e100000000 causes an app lock. Also, what is going on with that app icon? Many startups nowadays have forced quirky-and-random mascots, but here it doesn't make much sense.

coldtea 11y ago
It's obviously a play on the Go mascot, in the same style and probably by the same artist.
throwaway41597 11y ago
1e100000000 would require about 41 MB [0] of storage so that's not as crazy as I thought. No idea what kind of CPU you need for anything other than an addition though. [0]: log(1eN) / log(10) = N ; therefore: bits_required = log2(1e100000000) = 100000000 * log(10) / log(2) = 3.3e8 bits = 41 MB

ctdonath 11y ago

While I understand accurate handling of big numbers is difficult, I'm surprised it's not the general norm for calculator programs/apps by now. Glad to see someone has done so (not the first, but they are rare).

akhilcacharya 11y ago

More information here - https://sourcegraph.com/blog/live/gophercon2015/123653512740 https://sourcegraph.com/blog/live/gophercon2015/123653512740 "Example of porting a Go application to mobile ivy is a command line tool developed by Rob Pike. It’s a useful desktop calculator that hangles big int, rational and floating-point numbers, vectors, matrices. It’s an interpreter for an APL-like language. It is ~5k lines of Go code (not including tests, docs). It imports math, math/big, unicode, etc. Rewriting all that in Java or Objective-C would be a lot of work and is a non-starter, since this is already just works in Go. After 2 hours, Hana had a working prorotype."

shanemhansen 11y ago
Hana told Rob she had written a mobile app in go in 2 hours. His response: "why did it take you 2 hours?". Classic.