按数组属性的长度对 JavaScript 对象进行排序

Question

I have an object like this:

var list = {
  "you": [100,200,300], 
  "me": [75,4,5,6,8,9], 
  "foo": [116,345,1,23,56,78], 
  "bar": [15,34]
};

Is there any way to sort this object by the length of the array properties?

Expected output:

var res =  [[116,345,1,23,56,78],[75,4,5,6,8,9],[100,200,300],[15,34]]

I tried using lodash's sortby function.

 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>

Answer 1

1. If you want the output as an array of sorted array values:

   Use destructuring assignment to get the length property from the resulting array by calling Object.values and then sort it in descending order.

 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);

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2. If you want to sort the object itself by re-arranging the keys as per the length of array values.

   Is there any way to sort this object by the length of the array properties?

   If you want to re-arrange the original object properties as per the length of the array values, then we first need to sort by the keys and then create a new object with the sorted order of the keys utilizing Array.reduce .

 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);

Answer 2

You can use Object.values() to get the values in an array and then sort the resulting 2D array based on the length like this:

 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)