通过分组与相同属性的对象数组减少到 [英] reduce array to a by grouping objects with same property
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问题描述
我有对象的数组,我通过类似的属性值,试图将它们分组。因此,可以说这里是阵列
I have an array of objects and I am trying to group them by similar property value. So lets say here is array
[
{
"size":"6.5",
"width":"W"
},
{
"size":"6.5",
"width":"M"
},
{
"size":"7.5",
"width":"w"
},
{
"size":"8",
"width":"M"
},
{
"size":"8",
"width":"w"
}
]
和我试图得到这样的事情
and i am trying to get something like this
[
{
"size_new":"6.5",
"width_group":[
"W",
"M"
]
},
{
"size_new":"7.5",
"width_group":[
"M"
]
},
{
"size_new":"8",
"width_group":[
"w",
"M"
]
}
]
我的js看起来像这样
My js looks like this
var _x = [];
for(var i = 0; i < x.length; i++){
if(x[i].size == x[i+1].size){
_x[i] = {
new_size: x[i].size,
width_group: [x[i].width,x[i+1].width]
}
}
}
下面是我的小提琴
http://jsfiddle.net/sghoush1/ogrqg412/1/
我是pretty确保有可能是一个巨大的大洞在我的逻辑
I am pretty sure that there is probably a giant gaping hole in my logic
推荐答案
一个简单的方法,这样做将是打入几个步骤如下:
One simple way to do this would be to break this into several steps:
var sizeSorter = function(a, b) {return a - b};
var sizes = data.reduce(function(acc, item) {
(acc[item.size] || (acc[item.size] = [])).push(item.width);
return acc;
}, {}); //=> {8: ['M', 'W'], '6.5': ['W', 'M'], '7.5': ['W']}
Object.keys(sizes).sort(sizeSorter).map(function(size) {
return {size_new: size, width_group: sizes[size]};
});
这是排序是必要的,因为钥匙将数组进行排序,像'8'小数字像'6.5'。
That sorting is necessary because the keys will be sorted in Array order, with small numbers like '8' before strings like '6.5'.
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