使用js按多个属性分组的javascript对象 [英] javascript object grouped by multiple attributes using js
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问题描述
这是我的JavaScript对象.我想要一种方法来动态生成按一个或多个属性分组的对象.参数 attrs
是一个数组,其中包含一些用于分组的属性.
Here is my JavaScript object. I want to have a method to dynamically generate an object grouped by one or more attributes. The parameter attrs
is an array, which contains some attributes for grouping.
var input= [
{fistname:'Joe', age:'10', sex:'boy', class:'3'},
{fistname:'Tom', age:'11', sex:'boy', class:'3'},
{fistname:'Amily', age:'10', sex:'girl', class:'3'},
{fistname:'Bob', age:'11', sex:'boy',class:'4'},
{fistname:'Susan', age:'12', sex:'girl', class:'4'}
]
var attrs = ['age', 'class'];
function json2group(input, attrs){...}
结果:
[
{
label:'10',
groups:[
{
label:'3',
groups:[
{fistname:'Joe', age:'10', sex:'boy', class:'3'},
{fistname:'Amily', age:'10', sex:'girl', class:'3'}
]
}
]
},
{
label:'11',
groups:[
{
label:'3',
groups:[
{fistname:'Tom', age:'11', sex:'boy', class:'3'}
]
},
{
label:'4',
groups:[
{fistname:'Bob', age:'11', sex:'boy',class:'4'}
]
}
]
},
{
label:'12',
groups:[
{
label:'4',
groups:[
{fistname:'Susan', age:'12', sex:'girl', class:'4'}
]
}
]
}
]
请帮助我.
推荐答案
您可以使用纯JS.
var input = [
{fistname:'Joe', age:'10', sex:'boy', class:'3'},
{fistname:'Tom', age:'11', sex:'boy', class:'3'},
{fistname:'Amily', age:'10', sex:'girl', class:'3'},
{fistname:'Bob', age:'11', sex:'boy',class:'4'},
{fistname:'Susan', age:'12', sex:'girl', class:'4'}
];
var attrs = ['age', 'class'];
function GroupByArbitraryNumOfGroup(array, attrs) {
var output = [];
for (var i = 0; i < array.length; ++i) {
var ele = array[i];
var groups = output;
for (var j = 0; j < attrs.length; ++j) {
var attr = attrs[j];
var value = ele[attr];
var gs = groups.filter(function(g) {
return g.hasOwnProperty('label') && g['label'] == value;
});
if (gs.length == 0) {
var g = {};
g['label'] = value;
g['groups'] = [];
groups.push(g);
groups = g['groups'];
} else {
groups = gs[0]['groups'];
}
}
groups.push(ele);
}
return output;
}
var o = GroupByArbitraryNumOfGroup(input, attrs);
您将获得 o
作为
[{
'label': '10',
'groups': [{
'label': '3',
'groups': [{
'fistname': 'Joe',
'age': '10',
'sex': 'boy',
'class': '3'
}, {
'fistname': 'Amily',
'age': '10',
'sex': 'girl',
'class': '3'
}]
}]
}, {
'label': '11',
'groups': [{
'label': '3',
'groups': [{
'fistname': 'Tom',
'age': '11',
'sex': 'boy',
'class': '3'
}]
}, {
'label': '4',
'groups': [{
'fistname': 'Bob',
'age': '11',
'sex': 'boy',
'class': '4'
}]
}]
}, {
'label': '12',
'groups': [{
'label': '4',
'groups': [{
'fistname': 'Susan',
'age': '12',
'sex': 'girl',
'class': '4'
}]
}]
}]
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