Question

我在Angular 4应用程序中有json数组对象，我需要在我的JSON数组中找到唯一的空间类型。

Json Array：

[{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Hospital_Lab"}},
{"label":{"Space_Type":"Office_OpenOffice"}},
{"label":{"Space_Type":"Office_PrivateOffice"}},
{"label":{"Space_Type":"Office_PrivateOffice"}},{},
{"label":{"Space_Type":"Office_PrivateOffice"}},
{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Hospital_Lab"}},{"label":{"Space_Type":"Office_OpenOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_OpenOffice"}},{}]

我想删除所有重复的空间类型。任何人都可以告诉我如何获得。我想要结果：

[{Idx:0,Label:"Office_PrivateOffice"},{Idx:1,Label:"Office_OpenOffice"}]

Answer 1

您可以使用lodash方法 _.uniqWith

var jsonarray =  [{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Hospital_Lab"}},
{"label":{"Space_Type":"Office_OpenOffice"}},
{"label":{"Space_Type":"Office_PrivateOffice"}},
{"label":{"Space_Type":"Office_PrivateOffice"}},{},
{"label":{"Space_Type":"Office_PrivateOffice"}},
{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Hospital_Lab"}},{"label":{"Space_Type":"Office_OpenOffice"}},{"label":{"Space_Type":"Office_PrivateOffice"}},{"label":{"Space_Type":"Office_OpenOffice"}},{}];


var filtered =  _.uniqWith(jsonarray, _.isEqual);

console.log(filtered);

<script src='https://cdn.jsdelivr.net/lodash/4.17.2/lodash.min.js'></script>

Answer 2

也可以使用lodash方法CardValues = [ace, king, queen, jack, 10, 9, 8, 7, 6, 5, 4, 3, 2], CardSuits = [spades,hearts,clubs,diamonds], CartesianList = [{X, Y} || X <- CardValues, Y <- CardSuits ], io:format("\nCartesianList:~p\n",[CartesianList]).。使用这种方法的好处是你可以告诉lodash你要删除哪个元素的副本。

_.uniqBy(root, 'duplicateElement');

在Angular中，您需要下载包var newJsonFile = _.uniqBy(label, 'Space_Type'); console.log(newJsonFile);

lodash

然后导入

npm install lodash

Angular 4从Array对象中删除重复项

2 个答案: