How can I remove an element from a list with lodash

Question

I have an object that looks like this   var obj          objectiveDetailId   285       objectiveId   29       number   1       text    x        subTopics               subTopicId   1           number   1                   subTopicId   2           number   32                   subTopicId   3           number   22          var stToDelete   2    I have lodash installed in my application for other things  Is there an efficient way to use lodash to delete the entry    subTopicId  2   number  32  from the obj object   Or is there a javascript way to do this

User · Answer

There are four ways to do this as I know

const array = [{id:1,name:'Jim'},{id:2,name:'Parker'}];
const toDelete = 1;

The first:

_.reject(array, {id:toDelete})

The second one is :

_.remove(array, {id:toDelete})

In this way the array will be mutated.

The third one is :

_.differenceBy(array,[{id:toDelete}],'id')
// If you can get remove item 
// _.differenceWith(array,[removeItem])

The last one is:

_.filter(array,({id})=>id!==toDelete)

I am learning lodash

Answer to make a record, so that I can find it later.

User · Answer

Just use vanilla JS  You can use splice to remove the element   obj subTopics splice 1  1     Demo

User · Answer

you can do it with  pull      pull obj  subTopics       subTopicId  2   number  32      check the reference

User · Answer

lodash and typescript  const clearSubTopics     filter obj subTopics  topic   gt      isEqual topic subTopicId  2     console log clearSubTopics

User · Answer

In Addition to  thefourtheye answer  using predicate  instead of traditional anonymous functions       remove obj subTopics   currentObject    gt            return currentObject subTopicId     stToDelete            OR  obj subTopics     filter obj subTopics   currentObject    gt        return currentObject subTopicId     stToDelete

User · Answer

You can use removeItemFromArrayByPath function which includes some lodash functions and splice        Remove item from array by given path and index       Note  this function mutates array         param  Object Array  data  object or array      param  Array String  The array path to remove given index     param  Number  index to be removed from given data by path        returns  undefined       const removeItemFromArrayByPath    data  arrayPath  indexToRemove    gt      const array     get data  arrayPath         if     isEmpty array         array splice indexToRemove  1           You can check the examples here  https   codepen io fatihturgut pen NWbxLNv

User · Answer

Here is the simple lodash function with array and deleting it with the index number   index tobe delete   1  fruit     a   apple     b   banana     c   choco      filter fruit   value  key   gt    return  key     index tobe delete

User · Answer

You can now use   reject which allows you to filter based on what you need to get rid of  instead of what you need to keep   unlike   pull or   remove that only work on arrays    reject is working on any  Collection  obj subTopics     reject obj subTopics   o    gt      return o number  gt   32

User · Answer

As lyyons pointed out in the comments  more idiomatic and lodashy way to do this would be to use   remove  like this    remove obj subTopics        subTopicId  stToDelete       Apart from that  you can pass a predicate function whose result will be used to determine if the current element has to be removed or not     remove obj subTopics  function currentObject        return currentObject subTopicId     stToDelete          Alternatively  you can create a new array by filtering the old one with   filter and assign it to the same object  like this  obj subTopics     filter obj subTopics  function currentObject        return currentObject subTopicId     stToDelete        Or  obj subTopics     filter obj subTopics   subTopicId  stToKeep

[javascript] How can I remove an element from a list, with lodash?

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