haveCommonEntry

function haveCommonEntry(arr1, arr2) {

    let tolerance = 8;

    if ( arr1.length < tolerance || arr2.length < tolerance ) {
        return arr1.some(item => arr2.includes(item));
    } else {
        const set1 = new Set(arr1); return arr2.some(v => set1.has(v));
        return set1;
    }
}