JAVASCRIPT

return longest string from array

arr.reduce((a, b)=> a.length > b.length ? a : b);

all longest strings javascript

function solution(inputArray) {
    return inputArray.reduce((r, s, i) => {
        if (!i || r[0].length < s.length) {
            return [s];
        }
        if (r[0].length === s.length) {
            r.push(s);
        }
        return r;
    }, []);
}

javascript find the longest string in array

Math.max(...(x.map(el => el.length)));