JS中的groupBy方法

   groupBy (list, fn) {
      const groups = {};
      list.forEach(function (o) {
        const group = JSON.stringify(fn(o));
        groups[group] = groups[group] || [];
        groups[group].push(o);
      });
      return groups;
    },
       for (let key in arr) {
      let _arr =arr[key]
      key = key.replace(/\"/g, "");
    AR.push({
        name: key,
        children: _arr
      });
    }
   

function groupBy( array , f ) {
    let groups = {};
    array.forEach( function( o ) {
        let group = JSON.stringify( f(o) );
        groups[group] = groups[group] || [];
        groups[group].push( o );
    });
    return Object.keys(groups).map( function( group ) {
        return groups[group];
    });
}

let list = [
    {"name": "John","Average":15,"High":10,"DtmStamp":1358226000000},
    {"name": "Jane","Average":16,"High":92,"DtmStamp":1358226000000},
    {"name": "Jane","Average":17,"High":45,"DtmStamp":1358226000000},
    {"name": "John","Average":18,"High":87,"DtmStamp":1358226000000},
    {"name": "Jane","Average":15,"High":10,"DtmStamp":1358226060000},
    {"name": "John","Average":16,"High":87,"DtmStamp":1358226060000},
    {"name": "John","Average":17,"High":45,"DtmStamp":1358226060000},
    {"name": "Jane","Average":18,"High":92,"DtmStamp":1358226060000}
];

let sorted = groupBy(list, function(item){
    return [item.name];
});
console.log(sorted);
 
[ [ { name: 'John', Average: 15, High: 10, DtmStamp: 1358226000000 },
    { name: 'John', Average: 18, High: 87, DtmStamp: 1358226000000 },
    { name: 'John', Average: 16, High: 87, DtmStamp: 1358226060000 },
    { name: 'John', Average: 17, High: 45, DtmStamp: 1358226060000 } ],
  [ { name: 'Jane', Average: 16, High: 92, DtmStamp: 1358226000000 },
    { name: 'Jane', Average: 17, High: 45, DtmStamp: 1358226000000 },
    { name: 'Jane', Average: 15, High: 10, DtmStamp: 1358226060000 },
    { name: 'Jane', Average: 18, High: 92, DtmStamp: 1358226060000 } ] ]