用reduce es6替换filter和map

我试图避免与过滤器和映射链接，但为什么我的reduce 返回未定义？

const data = [{
        value: "moto",
        passed: true
    },{
        value: "boat",
        passed: false
    }, {
        value: "car",
        passed: true
    }]

    // expected ['moto', 'car']
    // using filter and map
    data.filter(obj => obj.passed).map(obj => obj.value)

怎么了？data.reduce((accum, obj) => obj.checked && [...accum, obj.value], [])

你可以做：

const data = [{value: "moto",passed: true}, {value: "boat",passed: false}, {value: "car",passed: true}];
const result = data.reduce((a, { passed: p, value: v}) => p ? (a.push(v), a) : a, []);

console.log(result);