array.indexof multidimensional array with unknown key

Question

so I have a multidimensional array. I want to get the key of one of the sub arrays, given a value.

var MyArr = [];
MyArr[0] = ['cat','black',5]
MyArr[1] = ['dog','red',7]
MyArr[2] = ['pig','blue',4]

what I want to be able to do is use a value say 'blue' and have it return the key of 2 so that I could take that 2 and do something like MyArr[2][0] to get 'pig'

I couldn't quite get indexof to work correctly.

any thoughts?

Also has to be pure JS cannot use JQuery

If you always have exact same number of elements in all nested array then you can also use Math.floor( MyArr.flat().findIndex((val) => val === "blue") / MyArr.length ); — DecPK
– DecPK, Commented Jun 21, 2021 at 22:53

Andy · Accepted Answer · 2021-06-21 22:02:16Z

2

You can do it like this, using Array.findIndex() and Array.includes():

const arr = [
  ['cat','black',5],
  ['dog','red',7],
  ['pig','blue',4]
];

let i = arr.findIndex(a => a.includes('blue'));

console.log(i)

edited Jun 21, 2021 at 22:02

Andy

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answered Jun 21, 2021 at 21:57

Carsten Massmann

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