Dada una serie de objetos:
people = [ {id: "1", name: "abc", gender: "m", age:"15", country:"USA" }, {id: "2", name: "def", gender: "m", age:"25", country:"BRA" }, {id: "3", name: "ghi", gender: "f", age:"05", country:"CHI" }, {id: "4", name: "jkl", gender: "m", age:"35", country:"RUS" }, {id: "5", name: "mno", gender: "m", age:"41", country:"JAP" }, {id: "6", name: "pqr", gender: "f", age:"30", country:"COL" }, {id: "7", name: "stu", gender: "f", age:"31", country:"CAN" }, {id: "8", name: "vwx", gender: "m", age:"78", country:"USA" }, ]Y una serie de claves buscadas:
wantedKeys = ["name", "age", "country"]Rendimiento esperado:
peopleFiltered = [ {name: "abc", age:"15", country:"USA" }, {name: "def", age:"25", country:"BRA" }, {name: "ghi", age:"05", country:"CHI" }, {name: "jkl", age:"35", country:"RUS" }, {name: "mno", age:"41", country:"JAP" }, {name: "pqr", age:"30", country:"COL" }, {name: "stu", age:"31", country:"CAN" }, {name: "vwx", age:"78", country:"USA" }, ] ¿Cómo filtrar la matriz de people para devolver una nueva matriz de objetos solo con los elementos contenidos en la matriz de wantedKeys ?
Probablemente haya una forma aún más corta con reduce , pero este debería ser un punto de partida válido.
var peopleFiltered = people.map(person => { var obj = {}; wantedKeys.forEach((key) => obj[key] = person[key]); return obj; }); people = [{ id: "1", name: "abc", gender: "m", age: "15", country: "USA" }, { id: "2", name: "def", gender: "m", age: "25", country: "BRA" }, { id: "3", name: "ghi", gender: "f", age: "05", country: "CHI" }, { id: "4", name: "jkl", gender: "m", age: "35", country: "RUS" }, { id: "5", name: "mno", gender: "m", age: "41", country: "JAP" }, { id: "6", name: "pqr", gender: "f", age: "30", country: "COL" }, { id: "7", name: "stu", gender: "f", age: "31", country: "CAN" }, { id: "8", name: "vwx", gender: "m", age: "78", country: "USA" }, ] wantedKeys = ["name", "age", "country"] var peopleFiltered = people.map(person => { var obj = {}; wantedKeys.forEach((key) => obj[key] = person[key]); return obj; }); console.log(peopleFiltered);Hay una función lodash muy útil, elija que hace exactamente esto. Podemos combinar con Array.map() para obtener el resultado deseado:
people = [ {id: "1", name: "abc", gender: "m", age:"15", country:"USA" }, {id: "2", name: "def", gender: "m", age:"25", country:"BRA" }, {id: "3", name: "ghi", gender: "f", age:"05", country:"CHI" }, {id: "4", name: "jkl", gender: "m", age:"35", country:"RUS" }, {id: "5", name: "mno", gender: "m", age:"41", country:"JAP" }, {id: "6", name: "pqr", gender: "f", age:"30", country:"COL" }, {id: "7", name: "stu", gender: "f", age:"31", country:"CAN" }, {id: "8", name: "vwx", gender: "m", age:"78", country:"USA" }, ] wantedKeys = ["name", "age", "country"]; let result = people.map(p => _.pick(p, wantedKeys)); console.log('Result:'); result.forEach(r => console.log(JSON.stringify(r))) .as-console-wrapper { max-height: 100% !important; top: 0; } <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js" referrerpolicy="no-referrer"></script> También un enfoque de JavaScript estándar, usando Object.fromEntries() y Array.map() :
people = [ {id: "1", name: "abc", gender: "m", age:"15", country:"USA" }, {id: "2", name: "def", gender: "m", age:"25", country:"BRA" }, {id: "3", name: "ghi", gender: "f", age:"05", country:"CHI" }, {id: "4", name: "jkl", gender: "m", age:"35", country:"RUS" }, {id: "5", name: "mno", gender: "m", age:"41", country:"JAP" }, {id: "6", name: "pqr", gender: "f", age:"30", country:"COL" }, {id: "7", name: "stu", gender: "f", age:"31", country:"CAN" }, {id: "8", name: "vwx", gender: "m", age:"78", country:"USA" }, ] wantedKeys = ["name", "age", "country"]; let result = people.map(p => Object.fromEntries(wantedKeys.map(k => [k,p[k]]))); console.log('Result:'); result.forEach(r => console.log(JSON.stringify(r))) .as-console-wrapper { max-height: 100% !important; top: 0; }