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JS how to get a list of elements in a collection object
2022-07-01 21:37:00 【Desperately_ petty thief】
1、 The collection style is shown below :
2、 Our need is , How to get all the collections id list , Here's the picture :
3、 Solution use map Function ,arr It's our collective data :
arr.map(user => { return user.id }
4、 Other commonly used traversal functions are find、filter
find: You can find qualified objects in the collection
filter: You can filter out objects that meet our criteria
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