JS sort by predefined string values [duplicate]

Question

I have an array of items that I want to sort based on the category property:

const arr = [{
  id: 1,
  category: 'bar'
}, {
  id: 4,
  category: 'baz'
},
{
  id: 5,
  category: 'foo'
}]

What I want is to sort it based on the following order:

- foo
- bar
- baz

How can I do it with an array comparator?

arr.sort(function(a, b) {
  return ?
})

Do I need to give each category an order number and do a.order - b.order? Or there is another clever way to do it?

You can just sort them alphabetically

StackByMe
– StackByMe

2021-02-04 09:12:47 +00:00
Commented Feb 4, 2021 at 9:12 — StackByMe
– StackByMe, Commented Feb 4, 2021 at 9:12

Jamiec · Accepted Answer · 2021-02-04 09:10:55Z

1

You can put your order into an array and use indexOf within sort.

const arr = [{
  id: 1,
  category: 'bar'
}, {
  id: 4,
  category: 'baz'
},
{
  id: 5,
  category: 'foo'
}]

const order = ["foo","bar","baz"]

arr.sort( (a,b) => order.indexOf(a.category) - order.indexOf(b.category) )
console.log(arr)

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