如何比较两个长度不同但具有相同值的数组？

Question

For Example:

let array1 = [3, 1, 2, 5];
let array2 = [1, 2, 3];

How can I compare the both arrays to get my output a boolean value?

Answer 1

If you want to check if one array is a subset of another array then you could try something like this:

 let array1 = [3, 1, 2, 5]; let array2 = [1, 2, 3]; let isSubset = (arr1,arr2) => arr1.every(x=> arr2.includes(x)); console.log('Is array1 a subset of array2?',isSubset(array1,array2)); console.log('Is array2 a subset of array1?',isSubset(array2,array1));

Here first console.log returns false because not all elements of array1 are present in array2 .
But when we swap params inside isSubset function we now check if all of the elements of array2 are present in array1 . In this case we're getting true state.