Concating two arrays into one
You can make an object from first array a whole keys will be id of each object. Then use map() on b and return object having all props.
var a = [{
id: 'aBcDeFgH',
firstName: 'Juan',
lastName: 'Doe',
age: 32
},
{
id: 'zYxWvUt',
firstName: 'Alex',
lastName: 'Smith',
age: 24
}]
var b = [{
id: 'aBcDeFgH',
occupation: 'architect',
address: {
street: '123 Main St',
city: 'CityTown',
Country: 'USA'
}
},
{
id: 'zYxWvUt',
occupation: 'receptionist',
address: {
street: '555 Ocean Ave',
city: 'Beach City',
Country: 'USA'
}
}]
let obj = a.reduce((ac,a) => (ac[a.id] = a,ac),{});
let res = b.map(x => ({...x,...obj[x.id]}));
console.log(res)Sounds like you need to merge each item of each array together - and that they're both in the same order, in which case you could do:
const newList = []
a.forEach((item, index) => {
newList.push({
...item,
...b[index]
})
})
console.log(newList)