Limit Map

Install

npm install limit-map

Usage

limitMap

const limitMap = require('limit-map');

limitMap(array, func, {limit:..., qps:..., deltaMS:...}).then(...)

• map array

console.log(await limitMap([1,2,3,4], v=>2*v)) // => [2,4,6,8]

• except

try {
  await limitMap([2,5,8,11], errorIfEvenNumber) // throw num if num is 5 or 11
} catch (e) {
  // e => 5 
}

• default options

limitMap([100, 400, 200, 300], asyncFuncMS)

draw the time line:

   :0s-------|1s-------
100:=
200:==
300:===
400:====

• options with limit

limitMap([100, 400, 200, 300], asyncSleepMS, { limit: 2 })

draw the time line:

   :0s-------|1s-------
100:=
200: ==
400:====
300:   ===

• options with qps

limitMap([100, 400, 200, 300], asyncSleepMS, { qps: 2 })

draw the time line:

   :0s-------|1s-------
100:=
400:====
200:          ==
300:          ===

• options with deltaMs

limitMap([100, 400, 200, 300], asyncSleepMS, { deltaMs: 200 })

draw the time line:

   :0s-------|1s-------
100:=
400:  ====
200:    ==
300:      ===

• options with limit and deltaMs

limitMap([100, 400, 200, 300], asyncSleepMS, { limit: 2, deltaMs: 200 })

draw the time line:

   :0s-------|1s-------
100:=
200:    ==
400:  ====
300:      ===

• options with limit and qps

limitMap([100, 400, 200, 300], asyncSleepMS, { limit: 1, qps: 2 })

draw the time line:

   :0s-------|1s-------
100:=
400: ====
200:          ==
300:            ===

• options with qps and deltaMs

limitMap([100, 400, 200, 300], asyncSleepMS, { qps: 2, deltaMs: 200 })

draw the time line:

   :0s-------|1s-------
100:=
400:  ====
200:          ==
300:            ===

• options with limit and qps and deltaMs

limitMap([100, 400, 200, 300], asyncSleepMS, { limit: 1, qps: 2, deltaMs: 200 })

draw the time line:

   :0s-------|1s-------
100:=
400:  ====
200:          ==
300:            ===