如果值为真，如何获取对象数组的键

Question

I have an object. I want to get the keys if the value is true.

What I have tried:

 const data = [{superadmin: true, admin: false, user: false}] keys = Object.keys(data).filter(k => data[k]); console.log(typeof(data)); console.log(data) console.log(keys)

Expected Output:

["superadmin"]

Answer 1

For the given code

keys = Object.keys(data[0]).filter(k => data[0][k] === true);

should work.

Answer 2

This works

 const data = [{ superadmin: true, admin: false, user: false }] keys = data.map(obj => { const data = Object.keys(obj).filter((key) => { return.;obj[key] }) return data }).flat(1); console.log(keys)

Answer 3

Instead returning value, you simply assign the keys with a value of true to a variable, like this

 const data = [{superadmin: true, admin: false, user: false}] let mkeys data.map((obj) => { mkeys = Object.keys(obj).filter(k => obj[k]) }) console.log(mkeys)

Answer 4

This is very simple:

let keys=[];
for (let [key, value] of Object.entries(data)){
    if (data[key]) keys.push(key)
}
console.log(keys)

If you want one line:

keys = Object.keys(data).filter(k => data[k]);