const intersection = array1.filter(element => array2.includes(element));
let firstArray = ["One", "Two", "Three", "Four", "Five"]; let secondArray = ["Three", "Four"]; let map = {}; firstArray.forEach(i => map[i] = false); secondArray.forEach(i => map[i] === false && (map[i] = true)); let jsonArray = Object.keys(map).map(k => ({ name: k, matched: map[k] }));