Question

How to check whether an array is subset of another array in Node.js

Answer 1

function isSubset(arr1, arr2) {
	const size1 = arr1.length;
    const size2 = arr2.length;
    let j;
    for (let i = 0; i < size2; i++) {
        for (j = 0; j < size1; j++) {
             	if (arr2[i] == arr1[j])
                 break;
            	}
            	if (j == size1)
                	return false;
        }
        return true;
    }
    
const arr1 = [ 5, 1, 8, 12, 40, 7, 9, 100 ];
const arr2 = [ 8, 40, 9, 1 ];
 
if (isSubset(arr1, arr2))
    console.log("yes");
else
    console.log("no");
 
 
 
   
/*
run:
   
yes
   
*/

 

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Answer 2

const arr1 = [ 5, 1, 8, 12, 40, 7, 9, 100 ];
const arr2 = [ 8, 40, 9, 1 ];

const result = arr2.every(val => arr1.includes(val));

console.log(result);
 
 
 
   
/*
run:
   
true
   
*/

 

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