How to remove the undefined/null from array inside the array in angular

Question

DATA = [{
    application: [{
        name: 'Room1'
    },{
        name: 'Room2'
    },{
        name: 'Room3'
    },{
        name: 'Room4'
    },{
        name: 'Room5'
    }, , undefined, null, null],
    name: 'Batch 1',
    date: '2020-10-20'
}]

What I'm trying to do here is to remove the undefined/null from the array. the undefined/null should be remove.

output should be like this:

 [{
    application: [{
        name: 'Room1'
    },{
        name: 'Room2'
    },{
        name: 'Room3'
    },{
        name: 'Room4'
    },{
        name: 'Room5'
    }],
    name: 'Batch 1',
    date: '2020-10-20'
}]

it will remove the null or undefined

score 1 · Answer 1 · answered May 27 '20 at 10:15

DATA = [{
    application: [{
        name: 'Room1'
    },{
        name: 'Room2'
    },{
        name: 'Room3'
    },{
        name: 'Room4'
    },{
        name: 'Room5'
    }, , undefined, null, null],
    name: 'Batch 1',
    date: '2020-10-20'
}]

DATA[0].application = DATA[0].application.filter(i=> i);
console.log(DATA)

score 1 · Accepted Answer · answered May 27 '20 at 10:18

You could use the Array.prototype.filter method to keep only !!item (i.e. not-null, not-undefined, not-empty, not-false and not-zero items).

let DATA = [{
  application: [{
    name: 'Room1'
  }, {
    name: 'Room2'
  }, {
    name: 'Room3'
  }, {
    name: 'Room4'
  }, {
    name: 'Room5'
  }, , undefined, null, null],
  name: 'Batch 1',
  date: '2020-10-20'
}];
DATA[0].application = DATA[0].application.filter(item => !!item);
console.log(DATA);

How to remove the undefined/null from array inside the array in angular

2 Answers2