let array = []; let singleEle = []; const arr = [ { id: 1, {questionId : { _id: "5e2016a1560d8c2aa842e65d"} }}, { id: 1, {questionId : { _id: "5e1c211cc201f33834e7baf1"} }}, { id: 1, {questionId : { _id: "5e201733560d8c2aa842e65e"} }} ]; arr.forEach(item => { if (array[item.questionId._id] ) { } else{ array[item.questionId._id] = true; singleEle.push(item) } });
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let array = [];
let singleEle = [];
const arr = [
{ id: 1, {questionId : { _id: "5e2016a1560d8c2aa842e65d"} }},
{ id: 1, {questionId : { _id: "5e1c211cc201f33834e7baf1"} }},
{ id: 1, {questionId : { _id: "5e201733560d8c2aa842e65e"} }}
];
arr.forEach(item => {
if (array[item.questionId._id] ) {
}
else{
array[item.questionId._id] = true;
singleEle.push(item)
}
});