[英]How to extract specific properties from each JSON object using javascript
[英]how to extract properties from an object NodeJS?
我在使用 NodeJs 中的 get 請求(使用 express)獲取 object 中的屬性時遇到問題。 我有以下 object:
const amigos = [{
id: 1,
nombre: "laura",
pais: "Inglaterra",
lenguajes :[ {id: 0, lenguaje:"java"},"python","c++"],
hobbies : ["leer" , "pescar" , "tenis"]
},
{
id: 2,
nombre: "Rocío",
pais: "Argentina",
lenguajes :[ {id: 1, lenguaje:"C++"},"kotlin","GO"],
hobbies : ["correr" , "Natacion" , "Equitación"]
},
{
id: 3,
nombre: "Fede",
pais: "Argentina",
lenguajes :[ {id: 2, lenguaje:"PHP"},"python","swift"],
hobbies : ["Tiro con arco" , "Crossfit" , "Boxeo"]
},
{
id: 4,
nombre: "Dany",
pais: "Colombia",
lenguajes :[ {id: 3, lenguaje:"java"},"javascript","c++"],
hobbies : ["Futbol" , "pescar" , "Trekking"]
},
{
id: 4,
nombre: "Mariano",
pais: "Argentina",
lenguajes :[ {id: 4, lenguaje:"javascript"},"python","java"],
hobbies : ["Correr" , "Natacion" , "Basketball"]
}]
module.exports = amigos;
我只想提取愛好。
我嘗試了以下方法,但它一直讓我回到整個 object。 不僅是我需要的愛好:
app.get("/amigos", (req, res) => {
res.status(200);
// const hobbiesParam = req.params.hobbies;
// const response = amigos.map(
// (a) => { return a.hobbies.toLowerCase()
// });
res.json(amigos.hobbies);
});
編輯:預期的 output 應該是一個對象數組,只有每個人的姓名和愛好:
[
{ "nombre": "laura",
"hobbies": [
"leer",
"pescar",
"tenis"
]
},
...
]
只需使用Array.prototype.map()
:
const amigos = [{ id: 1, nombre: "laura", pais: "Inglaterra", lenguajes:[ {id: 0, lenguaje:"java"},"python","c++"], hobbies: ["leer", "pescar", "tenis"] }, { id: 2, nombre: "Rocío", pais: "Argentina", lenguajes:[ {id: 1, lenguaje:"C++"},"kotlin","GO"], hobbies: ["correr", "Natacion", "Equitación"] }, { id: 3, nombre: "Fede", pais: "Argentina", lenguajes:[ {id: 2, lenguaje:"PHP"},"python","swift"], hobbies: ["Tiro con arco", "Crossfit", "Boxeo"] }, { id: 4, nombre: "Dany", pais: "Colombia", lenguajes:[ {id: 3, lenguaje:"java"},"javascript","c++"], hobbies: ["Futbol", "pescar", "Trekking"] }, { id: 4, nombre: "Mariano", pais: "Argentina", lenguajes:[ {id: 4, lenguaje:"javascript"},"python","java"], hobbies: ["Correr", "Natacion", "Basketball"] }] console.log( amigos.map( ({ nombre, hobbies }) => ({ nombre, hobbies }) ) );
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