如何循环遍历对象数组并使用lodash检查该对象中的值是否与另一个数组中的项匹配

时间：2016-11-09 11:57:52

标签： javascript arrays lodash

我有一系列项目，其特色是这样的组件：

var featuredIds = ['footerB', 'headerA', 'landingA'];

我还有一个对象数组，看起来像这样：

[{
    "title": "first footer",
    "section": "structure",
    "categoryId": "footer",
    "uId": "footerA"
  },{
    "title": "second footer",
    "section": "structure",
    "categoryId": "footer",
    "uId": "footerB"
  },
  {
    "title": "first header",
    "section": "structure",
    "categoryId": "header",
    "uId": "headerA"
  },
  {
    "title": "first header",
    "section": "structure",
    "categoryId": "header",
    "uId": "headerB"
  },
  {
    "title": "first landing",
    "section": "structure",
    "categoryId": "landing",
    "uId": "landingA"
  },
  {
    "title": "second landing",
    "section": "structure",
    "categoryId": "landing",
    "uId": "landingB"
  },
  {
    "title": "third landing",
    "section": "structure",
    "categoryId": "landing",
    "uId": "landingC"
  },
  {
    "title": "first nav",
    "section": "structure",
    "categoryId": "navigation",
    "uId": "navA"
  },{
    "title": "first footer",
    "section": "components",
    "categoryId": "blog",
      "uId": "blogA"
  },
  {
    "title": "second footer",
    "section": "components",
    "categoryId": "blog",
    "uId": "blogB"
  },
  {
    "title": "first header",
    "section": "components",
    "categoryId": "contact_button",
    "uId": "contact_buttonA"
  },
  {
    "title": "first landing",
    "section": "components",
    "categoryId": "content_bloc",
    "uId": "content_blocA"
  },
  {
    "title": "second landing",
    "section": "components",
    "categoryId": "content_bloc",
    "uId": "content_blocB"
  },
  {
    "title": "third landing",
    "section": "components",
    "categoryId": "content_bloc",
    "uId": "content_blocC"
  },
  {
    "title": "first nav",
    "section": "components",
    "categoryId": "cover",
    "uId": "coverA"
  }]

我想创建一个新数组，它只保存与我在featureIds数组中提供的featureIds匹配的组件，如下所示：

[{
    "title": "second footer",
    "section": "structure",
    "categoryId": "footer",
    "uId": "footerB"
  },{
    "title": "first header",
    "section": "structure",
    "categoryId": "header",
    "uId": "headerA"
  },
  {
    "title": "first landing",
    "section": "structure",
    "categoryId": "landing",
    "uId": "landingA"
  }]

我已经看过使用_.some，_. find和其他一些但未能得到我想要的结果。我已经使用double for循环编写了这个，这就是为什么我希望我们能够将其删除/学习新东西。

2 个答案:

答案 0 :(得分：2)

您可以将lodash的链与_.keyBy()和_.at()一起使用：

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function filterBy(arr, filters) {
  return _(features)
  .keyBy('uId')
  .at(filters)
  .value();
}

var features = [{
  "title": "first footer",
  "section": "structure",
  "categoryId": "footer",
  "uId": "footerA"
}, {
  "title": "second footer",
  "section": "structure",
  "categoryId": "footer",
  "uId": "footerB"
}, {
  "title": "first header",
  "section": "structure",
  "categoryId": "header",
  "uId": "headerA"
}, {
  "title": "first header",
  "section": "structure",
  "categoryId": "header",
  "uId": "headerB"
}, {
  "title": "first landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingA"
}, {
  "title": "second landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingB"
}, {
  "title": "third landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingC"
}, {
  "title": "first nav",
  "section": "structure",
  "categoryId": "navigation",
  "uId": "navA"
}, {
  "title": "first footer",
  "section": "components",
  "categoryId": "blog",
  "uId": "blogA"
}, {
  "title": "second footer",
  "section": "components",
  "categoryId": "blog",
  "uId": "blogB"
}, {
  "title": "first header",
  "section": "components",
  "categoryId": "contact_button",
  "uId": "contact_buttonA"
}, {
  "title": "first landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocA"
}, {
  "title": "second landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocB"
}, {
  "title": "third landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocC"
}, {
  "title": "first nav",
  "section": "components",
  "categoryId": "cover",
  "uId": "coverA"
}];

var featuredIds = ['footerB', 'headerA', 'landingA'];

var result = filterBy(features, featuredIds);

console.log(result);
＆＃13; 
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.6/lodash.min.js"></script>
＆＃13;
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或者，如果您可以使用ES6，Array.prototype.filter()和Set的组合：

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const filterBy = (arr, filters) => {
  const filtersSet = new Set(filters);
  
  return arr.filter((item) => filtersSet.has(item.uId));
};

const featuredIds = ['footerB', 'headerA', 'landingA'];

const features = [{
  "title": "first footer",
  "section": "structure",
  "categoryId": "footer",
  "uId": "footerA"
}, {
  "title": "second footer",
  "section": "structure",
  "categoryId": "footer",
  "uId": "footerB"
}, {
  "title": "first header",
  "section": "structure",
  "categoryId": "header",
  "uId": "headerA"
}, {
  "title": "first header",
  "section": "structure",
  "categoryId": "header",
  "uId": "headerB"
}, {
  "title": "first landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingA"
}, {
  "title": "second landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingB"
}, {
  "title": "third landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingC"
}, {
  "title": "first nav",
  "section": "structure",
  "categoryId": "navigation",
  "uId": "navA"
}, {
  "title": "first footer",
  "section": "components",
  "categoryId": "blog",
  "uId": "blogA"
}, {
  "title": "second footer",
  "section": "components",
  "categoryId": "blog",
  "uId": "blogB"
}, {
  "title": "first header",
  "section": "components",
  "categoryId": "contact_button",
  "uId": "contact_buttonA"
}, {
  "title": "first landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocA"
}, {
  "title": "second landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocB"
}, {
  "title": "third landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocC"
}, {
  "title": "first nav",
  "section": "components",
  "categoryId": "cover",
  "uId": "coverA"
}];

const result = filterBy(features, featuredIds);

console.log(result);
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另一个lodash选项是_.intersectionWith()：

＆＃13;
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function filterBy(arr, filters) {
  return _.intersectionWith(arr, filters, function(value, filter) {
    return value.uId === filter;
  });
}

var features = [{
  "title": "first footer",
  "section": "structure",
  "categoryId": "footer",
  "uId": "footerA"
}, {
  "title": "second footer",
  "section": "structure",
  "categoryId": "footer",
  "uId": "footerB"
}, {
  "title": "first header",
  "section": "structure",
  "categoryId": "header",
  "uId": "headerA"
}, {
  "title": "first header",
  "section": "structure",
  "categoryId": "header",
  "uId": "headerB"
}, {
  "title": "first landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingA"
}, {
  "title": "second landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingB"
}, {
  "title": "third landing",
  "section": "structure",
  "categoryId": "landing",
  "uId": "landingC"
}, {
  "title": "first nav",
  "section": "structure",
  "categoryId": "navigation",
  "uId": "navA"
}, {
  "title": "first footer",
  "section": "components",
  "categoryId": "blog",
  "uId": "blogA"
}, {
  "title": "second footer",
  "section": "components",
  "categoryId": "blog",
  "uId": "blogB"
}, {
  "title": "first header",
  "section": "components",
  "categoryId": "contact_button",
  "uId": "contact_buttonA"
}, {
  "title": "first landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocA"
}, {
  "title": "second landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocB"
}, {
  "title": "third landing",
  "section": "components",
  "categoryId": "content_bloc",
  "uId": "content_blocC"
}, {
  "title": "first nav",
  "section": "components",
  "categoryId": "cover",
  "uId": "coverA"
}];

var featuredIds = ['footerB', 'headerA', 'landingA'];

var result = filterBy(features, featuredIds);

console.log(result);
＆＃13; 
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.6/lodash.min.js"></script>
＆＃13;
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＆＃13;

答案 1 :(得分：1)

您可以使用普通js中的filter()和includes()执行此操作。

＆＃13;
＆＃13; 
var data = [{"title":"first footer","section":"structure","categoryId":"footer","uId":"footerA"},{"title":"second footer","section":"structure","categoryId":"footer","uId":"footerB"},{"title":"first header","section":"structure","categoryId":"header","uId":"headerA"},{"title":"first header","section":"structure","categoryId":"header","uId":"headerB"},{"title":"first landing","section":"structure","categoryId":"landing","uId":"landingA"},{"title":"second landing","section":"structure","categoryId":"landing","uId":"landingB"},{"title":"third landing","section":"structure","categoryId":"landing","uId":"landingC"},{"title":"first nav","section":"structure","categoryId":"navigation","uId":"navA"},{"title":"first footer","section":"components","categoryId":"blog","uId":"blogA"},{"title":"second footer","section":"components","categoryId":"blog","uId":"blogB"},{"title":"first header","section":"components","categoryId":"contact_button","uId":"contact_buttonA"},{"title":"first landing","section":"components","categoryId":"content_bloc","uId":"content_blocA"},{"title":"second landing","section":"components","categoryId":"content_bloc","uId":"content_blocB"},{"title":"third landing","section":"components","categoryId":"content_bloc","uId":"content_blocC"},{"title":"first nav","section":"components","categoryId":"cover","uId":"coverA"}];
var featuredIds = ['footerB', 'headerA', 'landingA'];

var result = data.filter(function(e) {
  return featuredIds.includes(e.uId);
})

console.log(result)
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