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javascriptarraysinclude

Javascript check if value exsist in two arrays return missing value

I'd like to know IF a value is missing which one is missing.

Array1: You have these values at the moment

['cloud:user', 'cloud:admin']

Array2: You need to have these values in order to continue

['cloud:user', 'cloud:admin', 'organization:user']

Current method which returns true or false. But I'd like to know IF a value is missing which one is missing. For example: 'organization:user'. If nothing is missing return true.

let authorized = roles.every(role => currentResourcesResult.value.includes(role));
Solution

  • Just use filter method and check whether some of elements of arr1 is not equal to an element of an arr2:

    const missingValues = arr2.filter(f => !arr1.some(s => s ==f));

    An example:

    let arr1 = ['cloud:user', 'cloud:admin']
let arr2 = ['cloud:user', 'cloud:admin', 'organization:user'];
const missingValues = arr2.filter(f => !arr1.some(s => s ==f));
console.log(missingValues);