[英]Sort JavaScript object by length of array properties
我有一个这样的对象:
var list = {
"you": [100,200,300],
"me": [75,4,5,6,8,9],
"foo": [116,345,1,23,56,78],
"bar": [15,34]
};
有没有办法按数组属性的长度sort
这个对象进行sort
?
预期输出:
var res = [[116,345,1,23,56,78],[75,4,5,6,8,9],[100,200,300],[15,34]]
我尝试使用 lodash 的sortby
函数。
var data = { "abc": ["20288", "d8f0", "4a5d", "1a8a0"], "kkl": ["bnb", "lll", "zxc"], "F17": ["ee547", "42e9"], "cnv": ["20288", "d8f0", "4a5d", "1a8a0", "jh67"] } var res = _.sortBy(data, function(val) { return parseInt(val.length); }); console.log(res);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>
如果您希望输出为已排序数组值的数组:
通过调用Object.values
使用解构赋值从结果数组中获取length
属性,然后按降序对其进行排序。
const data = { "abc": ["20288", "d8f0", "4a5d", "1a8a0"], "kkl": ["bnb", "lll", "zxc"], "F17": ["ee547", "42e9"], "cnv": ["20288", "d8f0", "4a5d", "1a8a0", "jh67"] }; const res = Object.values(data).sort(({length:a}, {length:b}) => b - a); console.log(res);
如果您想通过根据数组值的长度重新排列键来对对象本身进行排序。
有没有办法按数组属性的长度对这个对象进行排序?
如果您想根据数组值的length
重新排列原始对象属性,那么我们首先需要按键排序,然后使用Array.reduce
以键的排序顺序创建一个新对象。
const data = { "abc": ["20288", "d8f0", "4a5d", "1a8a0"], "kkl": ["bnb", "lll", "zxc"], "F17": ["ee547", "42e9"], "cnv": ["20288", "d8f0", "4a5d", "1a8a0", "jh67"] }; //sorting in descending order const obj = Object.keys(data) .sort((a, b) => data[b].length - data[a].length ) .reduce((acc, ele) => { acc[ele] = data[ele]; return acc; }, {}); console.log(obj);
您可以使用Object.values()
获取数组中的值,然后根据length
对生成的二维数组进行sort
,如下所示:
var data = { "abc": ["20288", "d8f0", "4a5d", "1a8a0"], "kkl": ["bnb", "lll", "zxc"], "F17": ["ee547", "42e9"], "cnv": ["20288", "d8f0", "4a5d", "1a8a0", "jh67"] } const res = Object.values(data).sort((a, b) => b.length - a.length) console.log(res)
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