What is smallest way to split object into array of object based on key/value pairs in Javascript?

Question

I've got this object:

var obj = {
    family : [{name: 'will', age: 30}, {name: 'husain', age: 12}],
    friends : [{name: 'cody', age: 31}, {name: 'jeff', age: 11}],
    school : [{name: 'daniel', age: 20}, {name: 'carl', age: 15}]
}

convert it into this

var obj = [
    {family : [{name: 'will', age: 30}, {name: 'husain', age: 12}]},
    {friends : [{name: 'cody', age: 31}, {name: 'jeff', age: 11}]},
    {school : [{name: 'daniel', age: 20}, {name: 'carl', age: 15}]}
];

Write now I am using for..in to build a new array and create object with key as key for new object and so on.

I'm doing this right now

var arr = [];

for (let key in obj) {
    arr.push({key: obj[key]})
}

Without seeing the code you have it's hard to say much. Does your code work? Do you have some performance problems? — Pointy
– Pointy, Commented Jul 2, 2017 at 14:12
it works, but it takes a lot of space, and can't help but feel it'd could be simpler — Muhammad Umer
– Muhammad Umer, Commented Jul 2, 2017 at 14:13

maioman · Accepted Answer · 2017-07-02 14:14:36Z

4

I think Object.keys is your best option:

var obj = {
    family : [{name: 'will', age: 30}, {name: 'husain', age: 12}],
    friends : [{name: 'cody', age: 31}, {name: 'jeff', age: 11}],
    school : [{name: 'daniel', age: 20}, {name: 'carl', age: 15}]
}
var r = Object.keys(obj).map(x => ({[x]: obj[x]}) )

console.log(r)

answered Jul 2, 2017 at 14:14

maioman

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