问题描述
我的数据存储在 flatlist 中显示的状态,我想根据评级对数据进行排序.因此,如果我单击排序按钮,它们应按 升序
顺序排序,当我再次单击时,它们应按 降序
顺序排序.
我有一个存储在 state 中的对象数组,下面只是一段重要的数据.
show_data_list = [{ ratings : { total : 4, ...其他东西 } } ]
有没有办法做到这一点,我尝试使用对数组进行排序的 map 函数
list.map((a,b) => a-b)
但是我如何使用它来对我的对象数组进行排序,我无法传入 2 item.rating.overall
作为参数.
预先感谢您的帮助:)
您可以使用 javascript
内置的 sort
函数.你可以为它提供一个自定义的 comparer
函数,如果第一项优先,它应该返回一个负值,如果它们相同,则返回 0,如果第二个值应该优先,则返回正值.>
show_data_list.sort((a, b) => { return a.ratings.overall - b.ratings.overall; })
.这将按升序对数据进行排序.
show_data_list.sort((a, b) => { return b.ratings.overall - a.ratings.overall; })
.这将按降序对其进行排序.
I have data stored in a state that is shown in flatlist, I want to sort the data based on ratings. So if I click on sort button they should be sorted in ascending
order and when I click again, they should be sorted in descending
order.
I have an array of objects stored in state, below is just a piece of data that is important.
show_data_list = [{ ratings : { overall : 4, ...other stuff } } ]
Is there a way I could do it, I tried using the map function which sorts array
list.map((a,b) => a-b)
But how can I use this to sort my array of objects, I cant pass in 2 item.rating.overall
as the parameter.
Thanks in advance for the help :)
You can use javascript
's built in sort
function. You can provide a custom comparer
function for it, which should return a negative value if the first item takes precedence, 0 if they are the same and a positive value if the second value should take precedence.
show_data_list.sort((a, b) => { return a.ratings.overall - b.ratings.overall; })
. This will sort the data in the ascending order.
show_data_list.sort((a, b) => { return b.ratings.overall - a.ratings.overall; })
. This will sort it in the descending order.
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