Type script: extract array in object-CodePudding

I have object as below.

{ id: 1, property: [2,3] }

How could I change to

[ { id: 1, property: 2 }, { id: 1, property: 3 } ]

CodePudding user response：

using the map method, you map each item to another item

Here you take the id from each item and the value at index in the property array

const input = [ { id: 1, property: [2,3] } ];

const result = input[0].property.map((value, index) => ({
  id: input[0].id,
  property: value
}));

console.log(JSON.stringify(result, null, 2));

see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

CodePudding user response：

if the input is an array of elements you may use nested map and flat

const x = [
  {id: 1, property: [2, 3]},
  {id: 3, property: [5, 6]},
];
const result = x.map(item => item.property.map(prob => ({id: item.id, property: prob}))).flat();
console.log(result)

CodePudding user response：

const input = [ { id: 1, property: [2,3] } ];

const output = [];

input.forEach(obj => {
    if (Array.isArray(obj.property)) {
        obj.property.forEach(property => output.push({...obj, property}));
    } else {
        output.push(obj);
    }
});

console.log(output);