Multi Array filter based on another array

Question

I have a multi-array (arr1) and an arrey (arr2)

var arr1 = [["Id", "Sku", "Name"], [10, "xxx", "yyy"], [20, "aaa", "eee"]];
var arr2 = ["Id", "Name"];

I would like that when the values in arr1[0] is not an element of the arr2 all the index value will be removed, so I will get this output:

var arr3 =  if arr1[0] = arr2 
console.log(arr3); // [["Id", "Name"], [10, "yyy"], [20, "eee"]];

Any help?

Use .map() and .filter()

user5734311
– user5734311

2021-03-29 19:19:15 +00:00
Commented Mar 29, 2021 at 19:19 — user5734311
– user5734311, Commented Mar 29, 2021 at 19:19

jnpdx · Accepted Answer · 2021-03-29 19:35:20Z

1

First, build a list of the indexes to remove by seeing if the key exists in arr2. Then, return arr1 with those indexes filtered out of each element.

function filterUnusedElement(inputElement) {
  const indexesToRemove = inputElement.reduce((acc, val, index) => arr2.includes(val) ? acc : [...acc, index], []);
  return arr1.map(i => i.filter((_,index) => !indexesToRemove.includes(index)));
}

console.log(filterUnusedElement(arr1[0]));
// [["Id", "Name"], [10, "yyy"], [20, "eee"]]

edited Mar 29, 2021 at 19:35

answered Mar 29, 2021 at 19:24

jnpdx

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