How can I use indexOf in array of array? [duplicate]

Question

let answer = []; let arrA = [[1, 4], [3, 4], [3, 10]] let arrB = [[ 1, 4 ], [1, 10], [ 3, 4], [3, 10]]

the results of arrA.indexOf(arrB [i]) == -1 turn out to be false for all. How can I solve it?

not sure what you are trying to do

cmgchess
– cmgchess

2023-05-12 07:48:39 +00:00
Commented May 12, 2023 at 7:48 — cmgchess
– cmgchess, Commented May 12, 2023 at 7:48

Konrad · Accepted Answer · 2023-05-12 07:52:09Z

0

You can use findIndex

let answer = [];
let arrA = [
  [1, 4],
  [3, 4],
  [3, 10]
]
let arrB = [
  [1, 4],
  [1, 10],
  [3, 4],
  [3, 10]
]

for (const a of arrB) {
  const index = arrA.findIndex(o => o[0] === a[0] && o[1] === a[1])
  answer.push(index)
}

console.log(answer)

answered May 12, 2023 at 7:52

Konrad

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1 Comment

Dongjun Kim Over a year ago

Thanks a lot, but to make my answer correct, ` if(index== -1){ answer= a; }` this code worked.

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