I have 2 array of objects with as shown below.
I want to find the index by searching the child array 'sub' in parent array 'array1' keeping id as the key.
I want to search sub array in array1 and find the index of values like [0,1,2,3].
Hence my expected output should be [0,1,2,3].
//parent array
array1 = [
{ "id": "1111", "name": "a1"},
{ "id": "2222", "name": "a2" },
{ "id": "3333", "name": "a3" },
{ "id": "4444", "name": "a4" },
{"id": "5555", "name": "a5" },
];
//child array
sub = [
{ "id": "1111"},
{ "id": "2222" }
];
I'm struggling with find the child array on the parent array as it includes the array of objects with key values.
You could use a Set for all id of sub and then filter the indices for seen id of array1.
const
array1 = [{ id: "1111", name: "a1" }, { id: "2222", name: "a2" }, { id: "3333", name: "a3" }, { id: "4444", name: "a4" }, { id: "5555", name: "a5" }],
sub = [{ id: "1111" }, { id: "2222" }],
subIds = new Set(sub.map(({ id }) => id)),
result = [...array1.keys()].filter(i => subIds.has(array1[i].id));
console.log(result);You can compare two array in for loop like below.
const array1 = [
{ id: "1111", name: "a1" },
{ id: "2222", name: "a2" },
{ id: "3333", name: "a3" },
{ id: "4444", name: "a4" },
{ id: "5555", name: "a5" },
];
//child array
const sub = [{ id: "1111" }, { id: "2222" }];
const indexes = [];
for (let i = 0; i <= sub.length - 1; i++) {
const subID = sub[i].id;
for (let j = 0; j <= array1.length - 1; j++) {
const parentID = array1[j].id;
if(parentID === subID){
indexes.push(j)
}
}
}