雷雷

从下面的数组old里

var old = [ { id: 1, name: 'css', type: 'html' }, { id: 2, name: 'css', type: 'html' }, { id: 3, name: 'javacript', type: 'code' }, { id: 4, name: 'javacript', type: 'code' } ]

得到new

var new = [ { id: [1,2], name: 'css', type: 'html' }, { id: [3,4], name: 'javacript', type: 'code' } ]

实现

var isEqual = (a, b) => a.name === b.name && b.type === b.type; var create = e => { e.id = [e.id]; return e; } var getNew = old => old.reduce((acc, cur) => { let hasItem = acc.some(e => { let temp = isEqual(e, cur); if (temp) e.id.push(cur.id); return temp; }); if (!hasItem) acc.push(create(cur)) return acc; }, []);