Dfyjkt

I use Javascript ES6 and have an issue. Hope your guys help me.

I have an Array:

var commentList = [
 'id': 1, text: 'A', children: ['id': 2, text: 'B' ] ,
 'id': 4, text: 'asd', children: ,
 'id': 5, text: 'vx', children: ['id': 7, text: 'xxss' ] ,
 'id': 8, text: 'ghfdh', children: ['id': 15, text: 'I want to take this' ] ,
 'id': 10, text: 'A', children: ['id': 18, text: 'Bsda' ] ,
]

This is an Array with Parent - Child Structure. How can I get Exactly object 'id': 15, text: 'I want to take this' if I just have ID only

I tried but not work

var object = commentList.find(o => o.id === 15) => undefined

You could take an iterative and recursive approach by checking the id or taking the children.

const find = (array, id) => 
 var result;
 array.some(o => result = o.id === id ? o : find(o.children ;

var commentList = [ id: 1, text: 'A', children: [ id: 2, text: 'B' ] , id: 4, text: 'asd', children: , id: 5, text: 'vx', children: [ id: 7, text: 'xxss' ] , id: 8, text: 'ghfdh', children: [ id: 15, text: 'I want to take this' ] , id: 10, text: 'A', children: [ id: 18, text: 'Bsda' ] ];

console.log(find(commentList, 15));

I would extract the logic into a function and then iterate over the children array and return the one you requested (The first match).

var commentList = [
 'id': 1, text: 'A', children: ['id': 2, text: 'B' ] ,
 'id': 4, text: 'asd', children: ,
 'id': 5, text: 'vx', children: ['id': 7, text: 'xxss' ] ,
 'id': 8, text: 'ghfdh', children: ['id': 15, text: 'I want to take this' ] ,
 'id': 10, text: 'A', children: ['id': 18, text: 'Bsda' ] ,
]

const findChildById = (id, arr) => 
 const result = arr.find(o => o.id === id)
 if (result) return result
 for (const cm of arr) 
 const result = cm.children.find(o => o.id === id)
 if (result) return result
 

console.log(findChildById(10, commentList))

You can use for...of to find the find the item recursively. If there's no item, the function will return undefined:

const find = (array = , id) => 
 for (const item of array) 
 const result = item.id === id ? item : find(item.children, id);
 if(result) return result;
 
;

const commentList = [ id: 1, text: 'A', children: [ id: 2, text: 'B' ] , id: 4, text: 'asd', children: , id: 5, text: 'vx', children: [ id: 7, text: 'xxss' ] , id: 8, text: 'ghfdh', children: [ id: 15, text: 'I want to take this' ] , id: 10, text: 'A', children: [ id: 18, text: 'Bsda' ] ];

const result = find(commentList, 15);

console.log(result);

Following very simple and basic code should work for you. I assume that all id-s of all children elements in all arrays are unique. This code will find the first element that matches the id we are looking for;

var result = null;
var idToSearch = 15;
var i=0;
var j=0;

for(i=0; i<commentList.length; i++)
 var currentChildren = commentList[i].children;
 if(currentChildren && currentChildren.length > 0)
 for(j=0; j<currentChildren.length; j++)
 if(currentChildren[j].id === idToSearch)
 result=currentChildren[j];
 j=currentChildren.length;
 i=commentList.length;