Asynchronous javascript code with different paradigms
- [-] No parallelism.
- [-] Can not be isomorphic in general.
- [-] Expansive stack trace.
- [+] Very easy logic.
- [+] Easy to support.
- [+] Informative stack trace.
- [+] Fast (4ms).
TypeError: Cannot read property 'name' of null
at Object.module.exports.getName (./user.js:13:23)
at Object.module.exports.say (./greeter.js:2:41)
at Object.<anonymous> (./index.js:7:13)
at Module._compile (module.js:541:32)
at Object.Module._extensions..js (module.js:550:10)
at Module.load (module.js:456:32)
at tryModuleLoad (module.js:415:12)
at Function.Module._load (module.js:407:3)
at Function.Module.runMain (module.js:575:10)
at startup (node.js:160:18)
npm testController (index.js) gets user info from model (user.js) and calls view (greeter.js) to talk with user.
We want to load user info asynchronously. Let's do it with..
- [-] Non clear logic.
- [-] Too more code.
- [-] Need to rewrite all functions.
- [-] Hard to support.
- [-] Hard parallelism.
- [-] Non informative stack trace.
- [-] Slow (6ms).
- [+] Can be isomorphic.
TypeError: Cannot read property 'name' of null
at error (./user.js:31:30)
at fs.readFile.error (./user.js:20:16)
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:439:3)
- [-] Need to rewrite all functions.
- [-] Hard to support.
- [-] Non informative stack trace.
- [-] Slow (7ms).
- [+] Easy parallelism.
- [+] Can be isomorphic.
TypeError: Cannot read property 'name' of null
at getConfig.then.config (./user.js:19:22)
- [-] Need to rewrite all functions.
- [-] Can not be isomorphic (required generators support).
- [-] Non informative stack trace.
- [-] Slow (7ms).
- [+] Easy to support.
- [+] Easy parallelism.
TypeError: Cannot read property 'name' of null
at Object.<anonymous> (./user.js:18:33)
at next (native)
at onFulfilled (./node_modules/co/index.js:65:19)
- [-] Need to rewrite all functions.
- [-] Can not be isomorphic (required generators support).
- [-] Expansive stack trace.
- [-] Non informative stack trace.
- [-] Very slow (25ms).
- [+] Easy to support.
- [+] Easy parallelism.
TypeError: Cannot read property 'name' of null
at Object.<anonymous> (user.js:18:12)
at undefined.next (native)
at step (C:\proj\async-js\user.js:1:253)
at C:\proj\async-js\user.js:1:430
- [-] Can not be isomorphic (NodeJS only).
- [-] Slow (6ms).
- [*] Need to start application in fiber.
- [+] Need not to rewrite all funcitons.
- [+] Easy to support.
- [+] Informative stack trace.
- [+] Easy parallelism.
TypeError: Cannot read property 'name' of null
at Object.module.exports.getName (./user.js:14:23)
at Object.module.exports.say (./greeter.js:2:41)
at Future.task.error (./index.js:11:17)
at ./node_modules/fibers/future.js:467:21
- [-] Need to convert application from control-flow to data-flow.
- [-] Expansive stack trace.
- [-] Very slow (25ms).
- [*] Medium to support.
- [+] Need not to rewrite all funcitons.
- [+] Easy parallelism.
- [+] Can be isomorphic.
- [+] Informative stack trace.
TypeError: Cannot read property 'name' of null
at Object.module.exports.getName (./user.js:22:24)
at Object.module.exports.say (./greeter.js:2:41)
at $mol_atom.Atom [as handler] (./index.js:9:13)
at $mol_atom.pull (./node_modules/atom.ts:137:17)
at $mol_atom.actualize (./node_modules/atom.ts:126:23)
at $mol_atom.get (./node_modules/atom.ts:75:9)
at Function.$mol_atom.sync (./node_modules/atom.ts:328:34)
at $mol_defer.run (./node_modules/atom.ts:314:11)
at Function.$mol_defer.run (./defer/defer.ts:53:67)
at Timeout._onTimeout (./defer/defer.ts:28:11)
| Property | Sync | NodeJS | Promises | Generators | Async + Babel | Fibers | Atoms |
|---|---|---|---|---|---|---|---|
| Execution time on V8 | 4 ms | 6 ms | 7 ms | 7 ms | 25 ms | 6 ms | 25 ms |
| Parallelism | no | hard | easy | easy | easy | easy | easy |
| Isomorphism | some api | yes | yes | some vm | some vm | no | yes |
| Expansive stack | yes | no | no | no | no | no | yes |
| Informative stack | yes | no | no | no | no | yes | yes |
| Complexity of use | easy | hard | hard | easy | easy | easy | easy |
| Complexity of debug | easy | hard | hard | hard | hard | easy | easy |