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async-reduce
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#async-reduce
reduce
function for async reductions on arrays.
##Examples
var reduce = require('async-reduce')
function sum(a, b, cb) {
setTimeout(function() {
cb(null, a + b)
})
}
reduce([1, 2, 3], 1, sum, function(err, result) {
result.should.equal(7)
})
Concurrent reductions are also supported
var reduce = require('async-reduce').concurrent(2, 0, function(a, b) {
return a + b
})
reduce([1, 2, 3], 1, sum, function(err, result) {
result.should.equal(7) // still the same result
})
During such reduction the given array is splitted into several
chunks with total chunks number equal to concurrency level (it is
the first arg to .concurrent()
).
That chunks are reduced in parallel. That means that we need a
combine
function to assembel results from that independent reductions
(third arg). We also need some sort of unit
value to seed our
reductions (second arg). But we can omit unit
and combine
if we only interested in side effects:
var reduce = require('async-reduce').concurrent(5)
var items = []
reduce([1, 2, 3], null, function(_, item, cb) {
items.push(item)
cb()
}, function(err) {
items.should.include(1)
items.should.include(2)
items.should.include(3)
})
This lib takes care about sync callback calls. They do not cause stack overflows.
##Installation
via component
component install eldargab/async-reduce
via npm
npm install async-reduce
##License
MIT
FAQs
`reduce` function for async reductions on arrays.
The npm package async-reduce receives a total of 6,450 weekly downloads. As such, async-reduce popularity was classified as popular.
We found that async-reduce demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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