javascript - 如何操作数组对象并创建新数组

Question

我有 js 数组，如下所示:

var names = [{name:"high",id:1},{name:"high",id:2}, 
{name:"low",id:1},  {name:"low",id:2},{name:"medium",id:1},{name:"medium",id:2}];

我需要像这样创建另一个数组。

var newArr=[{name:high,items:[1,2]},{name:low,items:[1,2]},{name:medium,items:[1,2]}];

请建议我如何做到这一点。

Answer 1

Underscorejs基于解决方案

var obj = {};

_.each(names, function (e) {
    var o = obj[e.name];
    if (o) {
        o.items.push(e.id);
    } else {
        o = {name: e.name, items: [e.id]};
    }
    obj[e.name] = o;
});

var result = _.map(obj, function (e) {return e;});

纯js

var obj = {};
for (var i = 0; i < names.length; i++) {
    var e = names[i];
    var o = obj[e.name];
    if (o) {
        o.items.push(e.id);
    } else {
        o = {name: e.name, items: [e.id]};
    }
    obj[e.name] = o;
}
var result = [];
for (var k in obj) {
    if (obj.hasOwnProperty(k)) {
        result.push(obj[k]);
    }
};