const arr1 = [1,2,3,4,5]; const arr2 = [7,6,51]; function findCommon(arr1, arr2){ for(let i=0;i<arr1.length;i++){ for(let j=0;j<arr2.length;j++){ console.log(arr1[i],' ',arr2[j]); if(arr1[i]==arr2[j]) return true; } } return false; } function findCommon2(a1, a2){ const obj = new Set(a2); for(let a of a1){ if(obj.has(a)){ return true; } } return false; } function fc(a1, a2){ return a1.some(item => a2.includes(item)); } let bool = fc(arr1, arr2); console.log(bool);