LoDash - an array of DeepFlatten objects
I have the following collection. Every object can have an array of objects children
, which can have an array of objects children
, etc ...
[
{
"name": "John",
"age": 24,
"children": [
{
"name": "Jack",
"age": 53,
"children": [
{
"name": "Jenny",
"age": 88
}
]
}
]
},
{
"name": "George",
"age": 45,
"children": [
{
"name": "Chris",
"age": 38,
"children": [
{
"name": "Nick",
"age": 35,
"children": [
{
"name": "Maria",
"age": 63
}
]
}
]
}
]
}
]
I want to flatten a collection recursively to get the following result:
[
{
"name": "John",
"age": 24
},
{
"name": "Jack",
"age": 53
},
{
"name": "Jenny",
"age": 88
},
{
"name": "George",
"age": 45
},
{
"name": "Chris",
"age": 38
},
{
"name": "Nick",
"age": 35
},
{
"name": "Maria",
"age": 63
}
]
How can I do this in lodash.js?
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3 answers
Try:
var data=[{"name":"John","age":24,"children":[{"name":"Jack","age":53,"children":[{"name":"Jenny","age":88}]}]},{"name":"George","age":45,"children":[{"name":"Chris","age":38,"children":[{"name":"Nick","age":35,"children":[{"name":"Maria","age":63}]}]}]}]
function getPeople(persons){
var result = [];
_.each(persons, function(person){
result.push({name: person.name, age: person.age});
person.children && (result = _.union(result,getPeople(person.children)))
});
return result
}
document.write(JSON.stringify(getPeople(data)))
<script src="https://lodash.com/_js/lodash.js"></script>
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You can do this with a recursive function calling itself for each child and concatenating in the same array:
function listPeople(list) {
var people = [];
for (var person in list) {
people.push({name: person.name, age: person.age});
if (person.children) {
var children = listPeople(person.children);
people = people.concat(children);
}
}
return people;
}
Then just give it your first array and the second one should be returned.
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You may try:
var _ = require('lodash');
var a = [
{
"name": "John",
"age": 24,
"children": [
{
"name": "Jack",
"age": 53,
"children": [
{
"name": "Jenny",
"age": 88
}
]
}
]
},
{
"name": "George",
"age": 45,
"children": [
{
"name": "Chris",
"age": 38,
"children": [
{
"name": "Nick",
"age": 35,
"children": [
{
"name": "Maria",
"age": 63
}
]
}
]
}
]
}
];
var list = [];
function filter(arr, items){
if(_.isArray(arr) && _.isArray(items)){
_.forEach(items, function(item){
if(item.name && item.age) {
arr.push({
name: item.name,
age: item.age
});
}
if(item.children && _.isArray(item.children)){
filter(arr,item.children);
}
});
}
}
filter(list, a);
console.log(list);
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