Check if arrays have same contents
JavaScript, Array · Oct 19, 2020

Checks if two arrays contain the same elements regardless of order.
- Use a
for...of
loop over aSet
created from the values of both arrays. - Use
Array.prototype.filter()
to compare the amount of occurrences of each distinct value in both arrays. - Return
false
if the counts do not match for any element,true
otherwise.
const haveSameContents = (a, b) => { for (const v of new Set([...a, ...b])) if (a.filter(e => e === v).length !== b.filter(e => e === v).length) return false; return true; }; haveSameContents([1, 2, 4], [2, 4, 1]); // true