nv-facutil-switch
v0.0.3
Published
nv-facutil-switch ================== - nv-facutil-switch is a simple-util to avoid using-of-switch-case - support async matcher AND async handler - if match, the default-action-after-handle is break, NOT continue
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nv-facutil-switch
nv-facutil-switch is a simple-util to avoid using-of-switch-case
support async matcher AND async handler
if match, the default-action-after-handle is break, NOT continue
switch-case normally can only be changed in COMPILE-TIME, it's NOT convinient
switch-case is HARD(maybe impossible) to auto-dynamic-handle in RUNTIME
install
- npm install nv-facutil-switch
usage
const {
cmmn,
creat_sync_simple_switch,
creat_async_simple_switch,
creat_sync_simple_switch_cache,
creat_async_simple_switch_cache,
creat_sync_nest_switch,
creat_async_nest_switch,
creat_sync_nest_switch_cache,
creat_async_nest_switch_cache,
} = require("nv-facutil-switch");example
nest
creat_SYNC_nest_switch support-only-SYNC-matcher-and-handler, but performance better
creat_ASYNC_nest_switch support-both-SYNC-AND-ASYNC-matcher-and-handler
//completion break-OR-continue ----default is break , NOT continue!!!! //CASE [matcher, handler,completion] //DEFAULT {matcher, handler} //----if DEFAULT exist ,completion always be BREAK //EMPTY //SWITCHER [ <CASE | SWITCHER>, ..... <CASE | SWITCHER>, <DEFAULT | EMPTY> ] const tmoutp = require('timers/promises').setTimeout; var dflt_handler = (r)=>'invalid' var entries = [//switch@root [(r)=>r%6===0, (r)=>r, /*default:cmmn.break*/], [ (r)=>r%6===1, [ //switch1@child [(r)=>r%7===0, (r)=>r, /*default:cmmn.break*/], [async(r)=>tmoutp(5000,r%7===1), (r)=>r, /*default:cmmn.break*/], [(r)=>r%7===2, (r)=>r, /*default:cmmn.break*/], {handler:(r)=>'invalid' ,completion:cmmn.break/*default:cmmn.break*/} //default CASE of switch1@child ], cmmn.break // this could be omitted,/*default:cmmn.break*/ ], [(r)=>r%6===2, (r)=>r, /*default:cmmn.break*/], [ (r)=>r%6===3, [//switch2@child [(r)=>r<50, (r)=>r, /*default:cmmn.break*/] //switch2@child without default CASE ], cmmn.break // this could be omitted,/*default:cmmn.break*/ ], {handler:async(r)=>tmoutp(5000,`invalid-last`), completion: cmmn.break /*default:cmmn.break*/} //default CASE of switch@root ] var ANestSwitch = creat_async_nest_switch(entries,dflt_handler) var switcher = new ANestSwitch()
;
await switcher.handle(6)
await switcher.handle(7)
await switcher.handle(31)
await switcher.handle(8)
await switcher.handle(63)
await switcher.handle(33)
await switcher.handle(34)
/*
> await switcher.handle(6)
6
> await switcher.handle(7)
7
> await switcher.handle(31)
'invalid'
> await switcher.handle(8)
8
> await switcher.handle(63)
undefined
> await switcher.handle(33)
33
> await switcher.handle(34)
'invalid-last'
>
*/nest-cache
simple
creat_SYNC_simple_switch support-only-SYNC-matcher-and-handler, but performance better
creat_ASYNC_simple_switch support-both-SYNC-AND-ASYNC-matcher-and-handler
const tmoutp = require('timers/promises').setTimeout; //ENTRY [match-function, handle-function, completion] // ----completion COULD-BE break-OR-continue , // ----default is break , NOT continue!!!! var entries = [ [(r)=>r===0, (r)=>0, /*default:cmmn.break*/], [(r)=>r===1, async(r)=>tmoutp(5000,100), /*default:cmmn.break*/], [ async(r)=>tmoutp(5000,r===2), (r)=>200, /*default:cmmn.break*/], ] var dflt_handler = (r)=>'invalid' var SimpleSwitch = creat_async_simple_switch(entries,dflt_handler) var switcher = new SimpleSwitch() await switcher.handle(0) //0 await switcher.handle(1) //100 await switcher.handle(2) //200 await switcher.handle(3) //'invalid' await switcher.handle(4) //'invalid' > await switcher.handle_rtrn_$breaker_handler_index_matcher$(1) { index: 1, matcher: [Function (anonymous)], handler: [AsyncFunction (anonymous)], breaker: true } >
simple-cache
var entries = [
[(r)=>r%3===0, (r)=>0, /*default:cmmn.break*/ ],
[(r)=>r%3===1, async(r)=>tmoutp(5000,100), /*default:cmmn.break*/ ],
[ async(r)=>tmoutp(5000,r%3===2), (r)=>200, /*default:cmmn.break*/ ],
]
var dflt_handler = (r)=>'invalid'
var SimpleSwitchCache = creat_async_simple_switch_cache(entries,dflt_handler)
var switcher = new SimpleSwitchCache()
await switcher.handle(5)
await switcher.handle(13)
await switcher.handle(6)
await switcher.handle(7)
await switcher.handle(87)
var matcher1 = entries[1][0]
matcher1
> switcher.group(matcher1)
[ 13, 7 ]
>
> switcher.group_cache_
[ [ 6, 87 ], [ 13, 7 ], [ 5 ] ]
>
> switcher.reset_group_cache()
> switcher.group_cache_
[ [], [], [] ]
>METHODS
nest
switcher._handle switcher.dflt_handler_
switcher.gen switcher.handle switcher.src_
switcher.tree_nest-cache
switcher._handle switcher.constructor switcher.dflt_cases_
switcher.dflt_handler_ switcher.gen switcher.group_cache_
switcher.handle switcher.handlers_ switcher.matchers_
switcher.reset_group_cache switcher.src_ switcher.tree_simple
switcher._handle switcher.breaker
switcher.breakers_ switcher.constructor
switcher.dflt_handler_ switcher.handle
switcher.handle_rtrn_$breaker$ switcher.handle_rtrn_$breaker_handler$
switcher.handle_rtrn_$breaker_handler_index$ switcher.handle_rtrn_$breaker_handler_index_matcher$
switcher.handle_rtrn_$breaker_handler_matcher$ switcher.handle_rtrn_$breaker_index$
switcher.handle_rtrn_$breaker_index_matcher$ switcher.handle_rtrn_$breaker_matcher$
switcher.handle_rtrn_$handler$ switcher.handle_rtrn_$handler_index$
switcher.handle_rtrn_$handler_index_matcher$ switcher.handle_rtrn_$handler_matcher$
switcher.handle_rtrn_$index$ switcher.handle_rtrn_$index_matcher$
switcher.handle_rtrn_$matcher$ switcher.handler
switcher.handlers_ switcher.idxes
switcher.matcher switcher.matchers_
switcher.src_simple-cache
switcher._handle switcher.breaker
switcher.breakers_ switcher.constructor
switcher.dflt_handler_ switcher.group
switcher.group_cache_ switcher.handle
switcher.handle_rtrn_$breaker$ switcher.handle_rtrn_$breaker_handler$
switcher.handle_rtrn_$breaker_handler_index$ switcher.handle_rtrn_$breaker_handler_index_matcher$
switcher.handle_rtrn_$breaker_handler_matcher$ switcher.handle_rtrn_$breaker_index$
switcher.handle_rtrn_$breaker_index_matcher$ switcher.handle_rtrn_$breaker_matcher$
switcher.handle_rtrn_$handler$ switcher.handle_rtrn_$handler_index$
switcher.handle_rtrn_$handler_index_matcher$ switcher.handle_rtrn_$handler_matcher$
switcher.handle_rtrn_$index$ switcher.handle_rtrn_$index_matcher$
switcher.handle_rtrn_$matcher$ switcher.handler
switcher.handlers_ switcher.idxes
switcher.matcher switcher.matchers_
switcher.reset_group_cache switcher.src_LICENSE
- ISC