How to return object based on value in nested array? (Javascript)

Question

I am trying to return all objects that have a specific 'id' in the nested array. In the sample data, I'd like to return all person objects with hobbies id of 2 (hiking).

The other question addresses the problem of finding all values in an array based on an object value.

This question differs from the previous because I need to return all objects based on a value inside of a nested array.

[ 
 { 
 "id":111222,
 "name":"Faye",
 "age":27,
 "hobbies":[ 
 { 
 "id":2,
 "name":"hiking"
 },
 { 
 "id":3,
 "name":"eating"
 }
 ]
 },
 { 
 "id":223456789001,
 "name":"Bobby",
 "age":35,
 "hobbies":[ 
 { 
 "id":2,
 "name":"hiking"
 },
 { 
 "id":4,
 "name":"online gaming"
 }
 ]
 }
]

• Akshay Khandelwal: Possible duplicate of How to access specific value from a nested array within an object array?
• Akshay Khandelwal: Haven't you already asked the same question here? stackoverflow.com/questions/38166623/…
• Rajesh Dixit: Dear Jasmin, SO is not get code for free site. You have to share your efforts as well.

Answer 1

function hasHobby(person, hobbyId) {
 return person.hobbies.some(function(hobby) {
 return hobby.id === hobbyId;
 });
}
function filterByHobby(people, hobbyId) {
 return people.filter(function(person) {
 return hasHobby(person, hobbyId);
 });
}

If you wanna use the new cool ES6 syntax:

function filterByHobby(people, hobbyId) {
 return people.filter(
 person => person.hobbies.some(
 hobby => hobby.id === hobbyId
 )
 );
}

Answer 2

var arr = [ 
 { 
 "id":111222,
 "name":"Faye",
 "age":27,
 "hobbies":[ 
 { 
 "id":2,
 "name":"hiking"
 },
 { 
 "id":3,
 "name":"eating"
 }
 ]
 },
 { 
 "id":223456789001,
 "name":"Bobby",
 "age":35,
 "hobbies":[ 
 { 
 "id":2,
 "name":"hiking"
 },
 { 
 "id":4,
 "name":"online gaming"
 }
 ]
 }
];
arr.filter(function(obj) {
 var hobbies = obj.hobbies;
 var x = hobbies.filter(function(hob) {
 if (hob.id == "2") return true;
});
if (x.length > 0) return true;
});

• Rajesh Dixit: You can use return hobbies.some instead.

Answer 3

Try this, I think its solve your proble:

var arr = [{
 "id": 111222,
 "name": "Faye",
 "age": 27,
 "hobbies": [{
 "id": 2,
 "name": "hiking"
 }, {
 "id": 3,
 "name": "eating"
 }]
}, {
 "id": 223456789001,
 "name": "Bobby",
 "age": 35,
 "hobbies": [{
 "id": 2,
 "name": "hiking"
 }, {
 "id": 4,
 "name": "online gaming"
 }]
}];
var x = arr.filter(function(el) {
 var rnel = el.hobbies.filter(function(nel) {
 return nel.id == 2;
 });
 return rnel.length > 0 ? true :false;
});
alert(x.length);

• user3560410: Nice running example