[Solved] how can I show the information of a list object

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This code should work. Use Object.keys and reduce, to map over every value and return the description:

const data = {
    1: [
        {id: 1, description: "teste", category: 1},
        {id: 73, description: "basica tb", category: 1}
    ],
    2: [
        {id: 3, description: "Teoria das ideias", category: 2}
    ],
    4: [
        {id: 5, description: "Mr with research computer.", category: 4}
    ],
    9: [
        {id: 10, description: "Vote drug thus no.", category: 9}
    ]
}

const getDescription = data => Object.keys(data).reduce((a, key) => ({...a, [key]: data[key].map(o => o.description)}), {})

console.log(getDescription(data))

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solved how can I show the information of a list object