I have an array of objects, and I need to return an object where its key is the type of pet and its value is an array with the names of the pets. but I can't create the array of the names.
let pets=[
{name:'kity', edad:10,type:'cat'},
{name:'saske', edad:10,type:'dog'},
{name:'naruto', edad:10,type:'dog'},
{name:'goku', edad:10,type:'cat'},
{name:'flofy', edad:10,type:'dog'},
{name:'flufin', edad:10,type:'cat'},
{name:'honey', edad:10,type:'bird'},
{name:'silvestre', edad:10,type:'cat'},
{name:'taz', edad:10,type:'dog'},
{name:'piolin', edad:10,type:'bird'},
{name:'gogeta', edad:10,type:'dog'},
]
const reduced = pets.reduce((acc, {name,type}) => ({
...acc, [`Type${type}`]: acc[...name]
}), {});
expected
reduce ={
Typecat:['kity','goku','flufin','silvestre'],
Typedog:['saske','naruto','flofy','taz','gogeta'],
Typebird:['honey','piolin']
}
You can do this:
let pets=[
{name:'kity', edad:10,type:'cat'},
{name:'saske', edad:10,type:'dog'},
{name:'naruto', edad:10,type:'dog'},
{name:'goku', edad:10,type:'cat'},
{name:'flofy', edad:10,type:''},
{name:'flufin', edad:10,type:'cat'},
{name:'honey', edad:10,type:'bird'},
{name:'silvestre', edad:10,type:'cat'},
{name:'taz', edad:10,type:'dog'},
{name:'piolin', edad:10,type:'bird'},
{name:'gogeta', edad:10,type:'dog'},
];
const result = pets.reduce((acc, item) => {
if(acc[`Type${item.type}`]) {
acc[`Type${item.type}`].push(item.name);
} else {
acc[`Type${item.type}`] = [item.name];
}
return acc;
}, {});
console.log(result);What you can do is:
const result = pets.reduce((acc, item) => {
const values = acc[item.type] ? acc[item.type].concat(item.name) : [item.name]
return {
...acc,
[item.type]: values
}
}, {});