let array1 = ['element1', 'element2', 'element3', 'element4']; let array2 = ['array2element', 'element2', 'element4']; let mutualArrayElements = []; for (let i = 0; i < array1.length; i++) { for (let j = 0; j < array2.length; j++) { if (array1[i] === array2[j]) { mutualArrayElements.push(array1[i]); } } }; // for nested loops