排序在Lodash 2.x的

Question

多個字段假設此數組：

var members = [ 
    {firstName: 'Michael', weight: 2}, 
    {firstName: 'Thierry', weight: 1}, 
    {firstName: 'Steph', weight: 3}, 
    {firstName: 'Jordan', weight: 3}, 
    {firstName: 'John', weight: 2} 
]; 

我想要（重量）以及對於每個種類重量的排序，通過firstNames分選（嵌套排序左右）。

結果將是：

[ 
    {firstName: 'Thierry', weight: 1}, 
    {firstName: 'John', weight: 2}, 
    {firstName: 'Michael', weight: 2}, 
    {firstName: 'Jordan', weight: 3}, 
    {firstName: 'Steph', weight: 3} 
]; 

我實現這個快速使用Lodash 2.4.1：

return _.chain(members) 
    .groupBy('weight') 
    .pairs() 
    .sortBy(function(e) { 
     return e[0]; 
    }) 
    .map(function(e){ 
     return e[1]; 
    }) 
    .map(function(e){ 
     return _.sortBy(e, 'firstName') 
    }) 
    .flatten() 
    .value(); 

有沒有更好的方式使用Lodash 2.4.1實現呢？

Answer 1

你可以連續兩類：

_(members).sortBy('firstName').sortBy('weight').value() 

Answer 2

它甚至在普通的JavaScript很短。

var members = [ 
 
    { firstName: 'Michael', weight: 2 }, 
 
    { firstName: 'Thierry', weight: 1 }, 
 
    { firstName: 'Steph', weight: 3 }, 
 
    { firstName: 'Jordan', weight: 3 }, 
 
    { firstName: 'John', weight: 2 } 
 
]; 
 

 
members.sort(function (a, b) { 
 
    return a.weight - b.weight || a.firstName.localeCompare(b.firstName); 
 
}); 
 

 
document.write('<pre>' + JSON.stringify(members, 0, 4) + '</pre>');