Tengo una matriz a continuación. Para cada "_id" en cada elemento de objeto de esta matriz, hay una matriz llamada "form" .
Lo que me gustaría obtener es el valor de _id answerValue donde el valor del field en el form es cState .
let array = [{ "_id" : "a1", "user" : "John", "form" : [ { "question" : "question1", "questionValue" : "Which state do you live in?", "answers" : [ "answer1" ], "answerValue" : [ "Arizona" ], "field" : "cState", }, { "question" : "question2", "questionValue" : "What is your nationality?", "answers" : [ "answer2" ], "answerValue" : [ "American" ], "field" : "nationality", }, "_id" : "a2", "user" : "Mike", "form" : [ { "question" : "question1", "questionValue" : "Which state do you live in?", "answers" : [ "answer3" ], "answerValue" : [ "Florida" ], "field" : "cState", }, { "question" : "question2", "questionValue" : "What is your nationality?", "answers" : [ "answer2" ], "answerValue" : [ "American" ], "field" : "nationality", }, }]Rendimiento esperado
[{ "_id" : "a1", "user" : "John", "answerValue": "Arizona" }, { "_id" : "a2", "user" : "Mike", "answerValue": "Florida" }, ]Esto es lo que probé:
let allDemographics allDemographics = array.map((item) => { return { user: item.array._id, nationality: item.array.nationality, state: item.array.form, } })Intentalo :
let array = [ { "_id" : "a1", "user" : "John", "form" : [ { "question" : "question1", "questionValue" : "Which state do you live in?", "answers" : [ "answer1" ], "answerValue" : [ "Arizona" ], "field" : "cState", }, { "question" : "question2", "questionValue" : "What is your nationality?", "answers" : [ "answer2" ], "answerValue" : [ "American" ], "field" : "nationality", } ] }, { "_id" : "a2", "user" : "Mike", "form" : [ { "question" : "question1", "questionValue" : "Which state do you live in?", "answers" : [ "answer3" ], "answerValue" : [ "Florida" ], "field" : "cState", }, { "question" : "question2", "questionValue" : "What is your nationality?", "answers" : [ "answer2" ], "answerValue" : [ "American" ], "field" : "nationality", }, ] } ] let allDemographics = array.map((item) => { let fieldCstate = item.form.find(form => form.field === "cState") return { _id: item._id, user: item.user, answerValue: fieldCstate.answerValue[0], } }) console.log(allDemographics)Este me gusta porque filtras antes de mapear. Si tuviera una matriz grande, esto podría brindarle un mejor rendimiento:
let arr = array.filter(x => x.form.every(y => y.field === "cState")); const data = arr.map((x) => ({ user: x.user, id: x._id, answer:x.form[0].answerValue })); console.log(data[0].answer)O una sola línea:
let arr = array.filter(x => x.form.every(y => y.field === "cState")) .map(x => ({ user: x.user, id: x._id, answer:x.form[0].answerValue }) )