Match array value with value in an array of objects javascript

Question

I am trying to work out how I can return a list with values from the own key in the array bellow if the object name value matches values in the lookupvalues array

lookupvalues = ["ross","linda"]
resources = [{own: "car", name: "bob"},{own: "bike", name: "ross"},{own: "plane", name: "linda"}]
wanted_output = ["bike","plane"]

I am struggling a bit with a good method to use for when I need to compare value in an object with array values. Is there a reasonable straight forward way to do this?

I must say how impressed I am that I got 4 replies with working examples at the same time!

hgb123 · Accepted Answer · 2020-12-08 07:32:11Z

1

One way (array method chaining) is that you could filter by name and map to grap each's own

const lookupvalues = ["ross", "linda"]
const resources = [
  { own: "car", name: "bob" },
  { own: "bike", name: "ross" },
  { own: "plane", name: "linda" },
]

const res = resources
  .filter(({ name }) => lookupvalues.includes(name))
  .map(({ own }) => own)

console.log(res)

answered Dec 8, 2020 at 7:32

hgb123

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Cory Harper · Accepted Answer · 2020-12-08 07:33:15Z

1

resources.filter(resource => lookupvalues.includes(resource.name))
  .map(resource => resource.own);

This will filter by the items that have names that are included in lookupvalues, and then transform the array into an array of the own values of those remaining.

answered Dec 8, 2020 at 7:33

Cory Harper

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Comments

Amardeep Bhowmick · Accepted Answer · 2020-12-08 07:34:11Z

1

You can take the help of Array#filter and Array#map:

const lookupvalues = ["ross","linda"]
const resources = [{own: "car", name: "bob"},{own: "bike", name: "ross"},{own: "plane", name: "linda"}]

const filterRes = (arr) => {
  const lookup = new Set(lookupvalues);
  return arr.filter(({name}) => lookup.has(name))
            .map(({own}) => own);
}
console.log(filterRes(resources));

answered Dec 8, 2020 at 7:34

Amardeep Bhowmick

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3 Comments

Cory Harper Over a year ago

Did you use a Set just for the optimization between includes and has?

Amardeep Bhowmick Over a year ago

@CoryHarper yes, here it won't make much difference but for a lengthy lookupvalues array it would.

Cory Harper Over a year ago

Same reason I was thinking to perhaps suggest making lookup values just an object of string => true pairs, when it's initialized.

Eason Yu · Accepted Answer · 2020-12-08 07:34:43Z

1

resources.filter(item => lookupvalues.indexOf(item.name) > -1).map(item => item.own)

answered Dec 8, 2020 at 7:34

Eason Yu

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