How do I change value of an array to another value based on a different array?

Question

I have an array that has an id and type value ({ id: '23', kind: 'apple' }, { id: '35', kind: broccoli }), but I have a function that requires a name for the id (pretend id 23 means fruits and id 35 means vegetables), such as 'fruits' or 'vegetables'. I write out a different array that has the id and the name for the id ({ id: '23', type: 'fruit' }, { id: '35', type: 'vegetable' }). How can I filter the first array so that I change the id from saying 23 or 35 to saying fruit or vegetable?

I could use an if else statement or a switch case statement, but there has to be an easier way. — ChrisRockGM
– ChrisRockGM, Commented May 9, 2014 at 20:38

Community · Accepted Answer · 2020-06-20 09:12:55Z

5

You can use Array#map to change the value of the id on the first array by looking up that id in a hash table.

hash table:

idHash = {'23': 'fruit', '35': 'vegetable'}

so that idHash['23'] returns "fruit"

Array#map

array = [{id: '23', kind:'apple'},{id: '35', kind:'broccoli'}]
array = array.map(function(item){
  item.id = idHash[item.id] //Lookup the 'type' fromt he hash table
  return item
})

console.log(array)

outputs [{"id":"fruit","kind":"apple"},{"id":"vegetable","kind":"broccoli"}]

edited Jun 20, 2020 at 9:12

CommunityBot

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answered May 9, 2014 at 20:38

bottens

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How do I change value of an array to another value based on a different array?

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hash table:

Array#map

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hash table:

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