提供的通用方法基于Array.prototype.reduce. 由于它使用accumulator其回調(diào)函數(shù)的參數(shù)作為可配置項，collector因此它完全不知道任何給定列表的任何已處理項目的鍵。只需要提供已處理項目的（源）鍵值，然后作為新分組鍵值的目標鍵...
function restructureKeysAndValues(collector, item) {
const {
keyOfTargetValue,
registry,
index,
list
} = collector;
const targetKey = item[keyOfTargetValue];
Object.entries(item).forEach(([key, value]) => {
if (key !== keyOfTargetValue) {
let keyGroup = registry[key];
if (!keyGroup) {
keyGroup = registry[key] = { [key]: {} };
Object.assign(index, keyGroup);
list.push(keyGroup);
}
keyGroup[key][targetKey] = value;
}
});
return collector;
}
console.log('a list of group objects ...', [{
"name": "Siner1",
"RTime": 40,
"FTime": 30
}, {
"name": "Siner2",
"RTime": 50,
"FTime": 60
}].reduce(restructureKeysAndValues, {
keyOfTargetValue: 'name',
registry: {}, // - for internal tracking
index: {}, // - for external use, output as map/index.
list: [] // - for external use, output as array/list.
}).list
);
console.log('a single grouped object ...', [{
"name": "Siner1",
"RTime": 40,
"FTime": 30
}, {
"name": "Siner2",
"RTime": 50,
"FTime": 60
}].reduce(restructureKeysAndValues, {
keyOfTargetValue: 'name',
registry: {}, // - for internal tracking
index: {}, // - for external use, output as map/index.
list: [] // - for external use, output as array/list.
}).index
);
console.log('a list of group objects ...', [{
"name": "Siner1",
"RTime": 40,
"FTime": 30,
"CTime": 70,
"ATime": 90
}, {
"name": "Siner2",
"RTime": 50,
"FTime": 60,
"CTime": 30,
"ATime": 40
}, {
"name": "Siner3",
"RTime": 90,
"FTime": 20,
"CTime": 10,
"ATime": 20
}].reduce(restructureKeysAndValues, {
keyOfTargetValue: 'name',
registry: {}, // - for internal tracking
index: {}, // - for external use, output as map/index.
list: [] // - for external use, output as array/list.
}).list
);
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