How do I remove an array item in TypeScript

Question

I have an array that I ve created in TypeScript and it has a property that I use as a key  If I have that key  how can I remove an item from it

User · Answer

If array is type of objects  then the simplest way is  let foo object    Item to remove this foo objects   this foo objects filter obj   gt  obj     foo object

User · Answer

This Worked for me Your Array   DummyArray  any       quot id quot   1   quot name quot    A      quot id quot   2   quot name quot    B      quot id quot   3   quot name quot    C      quot id quot   4   quot name quot    D     Function  remove    this DummyArray   this DummyArray filter item   gt  item     item     Note  This function deletes all the objects form your array  If you want to delete a specific object from array then use this method  remove id   this DummyArray   this DummyArray filter item   gt  item id     id

User · Answer

It is my solution for that   onDelete id  number        this service delete id  then      gt            let index   this documents findIndex d   gt  d id     id     find index in your array         this documents splice index  1    remove element from array              event stopPropagation

User · Answer

Here s a simple one liner for removing an object by property from an array of objects   delete this items this items findIndex item   gt  item item id    item id      or  this items   this items filter item   gt  item item id     item item id

User · Answer

let departments is an array  You want to remove an item from this array   departments  string           removeDepartment name  string   void       this departments   this departments filter item   gt  item    name

User · Answer

One more solution using Typescript    let updatedArray       for  let el of this oldArray        if  el     elementToRemove            updated push el           this oldArray   updated

User · Answer

Just wanted to add extension method for an array   interface Array lt T gt          remove element  T   Array lt T gt              Array prototype remove   function  element          const index   this indexOf element  0         if  index  gt  -1            return this splice index  1                 return this

User · Answer

You can use the splice method on an array to remove the elements   for example if you have an array with the name arr use the following   arr splice 2  1     so here the element with index 2 will be the starting point and the argument 2 will determine how many elements to be deleted   If you want to delete the last element of the array named arr then do this   arr splice arr length-1  1     This will return arr with the last element deleted   Example   var arr     orange    mango    banana    sugar    tea    arr splice arr length-1  1  console log arr      return   orange    mango    banana    sugar

User · Answer

Same way as you would in JavaScript     delete myArray key     Note that this sets the element to undefined   Better to use the Array prototype splice function   const index   myArray indexOf key  0   if  index  gt  -1       myArray splice index  1

User · Answer

With ES6 you can use this code     removeDocument doc      this documents forEach   item  index    gt         if item     doc  this documents splice index 1

User · Answer

Use this  if you need to remove a given object from an array and you want to be sure of the following    the list is not reinitialized the array length is properly updated       const objWithIdToRemove      const objIndex   this objectsArray findIndex obj   gt  obj id     objWithIdToRemove       if  objIndex  gt  -1          this objectsArray splice objIndex  1

User · Answer

Answer using TypeScript spread operator           Your key const key    two       Your array const arr          one        two        three         Get either the index or -1 const index   arr indexOf key      returns 0      Despite a real index  or -1  use spread operator and Array prototype slice       const newArray    index  gt  -1             arr slice 0  index          arr slice index   1      arr

User · Answer

let a  number          a push 1   a push 2   a push 3    let index  number   a findIndex a   gt  a     1    if  index    -1        a splice index  1      console log a

User · Answer

You can try to get index or position of list or array first  then use for loop to assign current array to a temp list  filter out unwanted item and store wanted item back to original array removeItem index        var tempList   this uploadFile      this uploadFile            for  var j   0  j  lt  tempList length  j            if  j    index          this uploadFile push tempList j

[arrays] How do I remove an array item in TypeScript?

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