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?
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user2342558
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Dongjun Kim
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not sure what you are trying to do – cmgchess May 12 '23 at 07:48
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Please visit the [help], take the [tour] to see what and [ask]. Do some research - [search SO for answers](https://www.google.com/search?q=javascript+2D+array+indexOf+site%3Astackoverflow.com). If you get stuck, post a [mcve] of your attempt, noting input and expected output using the [\[<>\]](https://meta.stackoverflow.com/questions/358992/ive-been-told-to-create-a-runnable-example-with-stack-snippets-how-do-i-do) snippet editor. – mplungjan May 12 '23 at 07:54
1 Answers
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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)
Konrad
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Thanks a lot, but to make my answer correct, ` if(index== -1){ answer= a; }` this code worked. – Dongjun Kim May 12 '23 at 09:05