JavaScript array find fitting range -

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i have following array 2 objects:

var myarr = [{   id: 3,   licences: 100   new_value_pr_licence: 40 }, {   id: 4,   licences: 200   new_value_pr_licence: 25 }]

a user wish buy 150 licences. means fall category 100 because above 100 licences below 200 means pay $40 per licence.

note array object values varies.

order plans price per licence:

myarr.sort(function (a, b) {   return a.new_value_pr_licence - b.new_value_pr_licence; })

then starting start of array, take many of plan can without going on number user wants buy:

var numuserwants = 150; var purchases = {}; var cheapestavailableproduct = myarr.shift(); while (numuserwants > 0 && cheapestavailableproduct) {     if (numuserwants <= cheapestavailableproduct.licences) {         purchases[cheapestavailableproduct.id] = math.floor(cheapestavailableproduct.licences / numuserwants);         numuserwants = cheapestavailableproduct.licences % numuserwants;     }     cheapestavailableproduct = myarr.shift(); }

at point, purchases map of plan id number:

purchases => {   3: 3   4: 1 }

this doesn't handle case over-purchasing cheapest option (eg: it's cheaper buy 160 @ 4x40, instead of 150 @ 3x40 + 1x25 + 1x5), it's start tweaking.


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