Parsing array of objects

Question

How to parse an array of objects, so I would end up with an array of all elements containing 'text' of 'ild'.

Here is a sample array:

public data: any[] = [
  {
    treeViewKey:0,
    id: 1,
    text: 'Root Node 1'
  }, {
    treeViewKey:1,
    id: 2,
    text: 'Root Node 2'
  }, {
    treeViewKey:1_0,
    id: 3,
    parentId: 2,
    text: 'Child node of Root Node 2'
  }, {
    treeViewKey:1_1,
    id: 4,
    parentId: 2,
    text: 'Child node of Root Node 2'
  }, {
    treeViewKey:1_2_0,
    id: 5,
    parentId: 4,
    text: 'Child node of Root Node 2'
  }
];

I should end up with 3 elements. What would be the best method to achieve that in javascript or typescript?

The final result should be:

      [
    {
    treeViewKey:1_0,
    id: 3,
    parentId: 2,
    text: 'Child node of Root Node 2'
  }, {
    treeViewKey:1_1,
    id: 4,
    parentId: 2,
    text: 'Child node of Root Node 2'
  }, {
    treeViewKey:1_2_0,
    id: 5,
    parentId: 4,
    text: 'Child node of Root Node 2'
  }
]

Possible duplicate of [Javascript: How to filter object array based on attributes?](https://stackoverflow.com/questions/2722159/javascript-how-to-filter-object-array-based-on-attributes) — Herohtar, Jan 02 '19 at 20:40
'text' is a property, and 'ild' is a text used for searching. As an example 'Child node...' contains word 'ild' — lucas, Jan 02 '19 at 20:43

score 3 · Accepted Answer · answered Jan 02 '19 at 20:45

If you are looking for all the children, you have a better property to get them.

That's the parentId. If the parentId is specified, then they are children.

So filter the data input looking for the ones with parentId property specified.

Below there is also the case looking for 'ild' in text as you asked.

const data = [
  {
    treeViewKey:0,
    id: 1,
    text: 'Root Node 1'
  }, 
  {
    treeViewKey:1,
    id: 2,
    text: 'Root Node 2'
  }, 
  {
    treeViewKey:'1_0',
    id: 3,
    parentId: 2,
    text: 'Child node of Root Node 2'
  }, {
    treeViewKey:'1_1',
    id: 4,
    parentId: 2,
    text: 'Child node of Root Node 2'
  }, {
    treeViewKey:'1_2_0',
    id: 5,
    parentId: 4,
    text: 'Child node of Root Node 2'
  }
];

// filter the elements with parentId property
console.log(data.filter(el => el.parentId));
// filter the elements with 'ild' string in text property
console.log(data.filter(el => el.text.includes('ild')));

score 0 · Answer 2 · answered Jan 02 '19 at 20:44

0

Something like:

const elements = data.filter(item => item.parentId);

answered Jan 02 '19 at 20:44

Jakob E

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Parsing array of objects

2 Answers2