使用lodash或者纯js把数组对象中相同的字段的值合并

1. lodash处理办法

1.1 数组内对象型数据

let fruitSamples = [      { id: 1, type: 'apples', samples: [{ id: 1, name: 1 }] },      { id: 2, type: 'bananas', samples: [{ id: 2, name: 2 }] },      { id: 3, type: 'pears', samples: [{ id: 3, name: 3 }] },      { id: 1, type: 'apples', samples: [{ id: 11, name: 11 }] },    ]    function customizer(objValue, srcValue) {      if (_.isArray(objValue)) {        return objValue.concat(srcValue)      }    }    let test = _(fruitSamples)      .flatten()      .groupBy('type')      .map(        _.spread((...values) => {          return _.mergeWith(...values, customizer)        }),      )      .value()console.log(test, 'test')结果：[  { id: 1, type: 'apples', samples: [{ id: 1, name: 1 },{ id: 11, name: 11 }] },  { id: 2, type: 'bananas', samples: [id: 2, name: 2 }] },  { id: 3, type: 'pears', samples: [{ id: 3, name: 3 }] }]

1.2 数组内数组内对象型数据

let fruitSamples = [  [    {'id': 1,'type': 'apples','samples': [1, 2, 3]},    {'id': 2,'type': 'bananas','samples': [1, 2, 7]},    {'id': 3,'type': 'pears','samples': [1, 2, 3]}  ],  [    {'id': 1,'type': 'apples','samples': [5, 2, 9]},    {'id': 2,'type': 'bananas','samples': [1, 7, 7]},    {'id': 3,'type': 'pears','samples': [12, 21, 32]}  ],  [    {'id': 1,'type': 'apples','samples': [11, 2, 33]},    {'id': 2,'type': 'bananas','samples': [17, 2, 67]},    {'id': 3,'type': 'pears','samples': [91, 22, 34]}  ]];function customizer(objValue, srcValue) {  if (_.isArray(objValue)) {    return objValue.concat(srcValue);  }}let test = _(fruitSamples)  .flatten()  .groupBy('type')  .map(_.spread((...values) => {    return _.mergeWith(...values, customizer);  }))  .value();  console.log(test);结果：[  { id: 1, type: 'apples', samples: [1, 2, 3, 5, 2, 9, 11, 2, 33] },  { id: 2, type: 'bananas', samples: [1, 2, 7, 1, 7, 7, 17, 2, 67] },  { id: 3, type: 'pears', samples: [1, 2, 3, 12, 21, 32, 91, 22, 34] }]

注：无论samples是单纯的数组内string或者者数组内number还是数组内Object都支持

2.1 纯js解决

let fruitSamples = [    {        foo: "A",        bar: [            { baz: "1", qux: "a" },            { baz: "2", qux: "b" }        ]    },    {        foo: "B",        bar: [            { baz: "3", qux: "c" },            { baz: "4", qux: "d" }        ]    },    {        foo: "A",        bar: [            { baz: "5", qux: "e" },            { baz: "6", qux: "f" }        ]    },    {        foo: "B",        bar: [            { baz: "7", qux: "g" },            { baz: "8", qux: "h" }        ]    }]const hash = Object.create(null)const test = fruitSamples.filter(function (o) {  if (!hash[o.foo]) {     hash[o.foo] = o.bar     return true  }  Array.prototype.push.apply(hash[o.foo], o.bar)})console.log(test)结果：[    {        foo: "A",        bar: [            { baz: "1", qux: "a" },            { baz: "2", qux: "b" },            { baz: "5", qux: "e" },            { baz: "6", qux: "f" }        ]    },    {        foo: "B",        bar: [            { baz: "3", qux: "c" },            { baz: "4", qux: "d" },            { baz: "7", qux: "g" },            { baz: "8", qux: "h" }        ]    }]

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