Removing a item from object with nested arrays

Question

Hi I have object like this

var obj= {
     _id: string;
    name: string;
    loc: [{
         locname: string;
         locId: string;
         locadd: [{
             st: string;
             zip: string;
         }]
     }]
}

Using typescript in angular 2 I want to delete a particular row

deleterow(i, j) {
  // i is index of loc 
  // j is index of locadd
  this.obj.loc.splice(i, 1) //works fine 
  this.obj.loc[i].locadd.splice(j, 1) //doesn't work. I don't get any error just 
  // row is not removed.
}

I am trying solution similar to given in this answer but doesn't work

JavaScript remove item from nested Array

Please let me know how I can remove the an item from locadd Thanks

What is j? "locadd" property has a single value .splice(0, 1). Given the value of "locadd" at the object at the question any value greater than 0 passed to first parameter of .slice() will not match any index within the array. — guest271314
– guest271314, Commented Feb 24, 2019 at 3:25
locadd is an array. j is index for locadd that I want to be removed. — J. Davidson
– J. Davidson, Commented Feb 24, 2019 at 3:26
Can you include the complete object and the expected result at the question and create a stacksnippets to demonstrate the issue? See stackoverflow.com/help/mcve — guest271314
– guest271314, Commented Feb 24, 2019 at 3:30

zmag · Accepted Answer · 2019-02-24 03:40:33Z

2

You deleted ith loc item. And then, You've referenced ith loc which is next of deleted loc item.

I think locadd should be deleted before delete loc.

this.obj.loc[i].locadd.splice(j,1)
this.obj.loc.splice(i, 1)

Update

I've made a snippet. It seems working.

var obj = {
  loc: [{
    locadd: [{
      st: '1',
      zip: '1',
    },{
      st: '2',
      zip: '2',
    },{
      st: '3',
      zip: '3',
    }]
  }]
};

function deleterow(i, j) {
  // i is index of loc 
  // j is index of locadd
  // this.obj.loc.splice(i, 1) //works fine 
  this.obj.loc[i].locadd.splice(j, 1) //doesn't work. I don't get any error just 
  // row is not removed.
}

console.log(this.obj.loc)
deleterow(0, 1)
console.log(this.obj.loc)

edited Feb 24, 2019 at 3:40

answered Feb 24, 2019 at 3:26

zmag

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4 Comments

J. Davidson Over a year ago

it doesn't work cause I am just trying this this.obj.loc[i].locadd.splice(j,1) The other this.obj.loc.splice(i,1) is just to show on first aray it works fine but nested it is not working

J. Davidson Over a year ago

I was trying to edit your code snipped didn't know how to. Can you add a second element on locadd[0] than remove the one. Cause I believe that is where it doesn't work. Thanks

zmag Over a year ago

@J.Davidson Can you update your post what your intended by code?

J. Davidson Over a year ago

Thank you for the snippet. Using it I was able to find out issue with j value, once corrected it worked fine. Thanks

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