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deep merge two objects with a rule. A new object is always returned.
I fear this may be a haskelly thing, I suspect it might be an applicative functor.
almost the same module as deep-merge but not quite.
var merge = require('map-merge')
merge(a, b, function (av, bv) {
//use the value from b if a's corrisponding value is null/undefined
return bv == null ? av : bv
// btw, this is the default merge rule.
})
objects are merged by their keys, first all the keys in the left object are added, then any keys in the right object which are not in the left.
This determins the order the keys appear in.
var merge = require('map-merge')
var a = {
a: 'apple',
b: 'banana',
d: 'durian'
}
var b = {
b: 'banana',
c: 'cherry'
e: 'elderberry'
}
var c = merge(a, b)
the order of the keys in c
will depend on the order in a and b
{
a: 'apple',
b: 'banana',
d: 'durian',
c: 'cherry',
e: 'elderberry'
}
MIT
FAQs
apply a map function to merge a pair of deep data structures
The npm package map-merge receives a total of 11,988 weekly downloads. As such, map-merge popularity was classified as popular.
We found that map-merge 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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