CODEWITHSUNDEEP
javascriptreactjsimmutable.js
MR.B
MR.B

Reputation: 55

How to get next element in Immutable List when use .map?

i have 1 immutable List like this 

const list = new List([
new Map({ title: 'first', complete: true }),
new Map({ title: 'second',complete: false }),
])

when i use

list.map((value,index) => {
//HOW TO GET VALUE OF NEXT ELEMENT IN HERE ?
})

Upvotes: 1

Views: 392

Answers (1)

Martin Vich
Martin Vich

Reputation: 1082

You can do it like this

list.map((value,index) => {
  const next = list.get(index + 1);
  // next will be undefined when the value is last one in the list (and index + 1) is out of bounds because of that
})

Just for clarification this example is using the fact that Immutable List is descendant of Collection.Indexed which has get(index) method

Upvotes: 2

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