仅作为学习记录下：
//分组，一维数组变为二维数组
function groupBy( array , f ) {
let groups = {};
array.forEach(item=>{
let group = JSON.stringify(f(item));
groups[group] = groups[group] || []; // groups['John']=groups['Jhone']||[];
groups[group].push(item);
});
console.log('groups:',groups);
console.log('======================')
return Object.keys(groups).map(key=> {
return groups[key];
});
}
let list = [
{"name": "John","Average":15,"High":10},
{"name": "Jane","Average":16,"High":92},
{"name": "Jane","Average":17,"High":45},
{"name": "John","Average":18,"High":87},
{"name": "Jane","Average":15,"High":10},
{"name": "John","Average":16,"High":87},
{"name": "John","Average":17,"High":45},
{"name": "Jane","Average":18,"High":92}
];
let sorted = groupBy(list, (item)=>{
return [item.name]
});
console.log(sorted);
