I've got a JSON array of objects like :
x= {"user":[{ "name": "Jhon", "age": "18" }, { "name": "Ted", "age": "20" }]};
I would like to store every values of names of each object in a simple array but I don't know how to do that
I know that I can get values of names with JSON.parse(x)["user][0]["name"]
So I need how to get the number of objects in my array of objects : Objects.keys(JSON.parse(x)["users"]).length)
Array#map()
const data = {"user":[{ "name": "Jhon", "age": "18" }, { "name": "Ted", "age": "20" }]};
console.log(data.user.map(u=>u.name));You can iterate over an array using the map function which takes a callback, and return exactly which property you want from each user object inside the callback. You'll be left with an array of names.
const myObject = {"user":[{ "name": "Jhon", "age": "18" }, { "name": "Ted", "age": "20" }]};
const names = myObject["user"].map((user) => {
return user["name"];
}
So you want to map the array of users (x.user) to new collection, getting only the names of the user. Take a look at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map .
In short:
var x = {"user":[{ "name": "Jhon", "age": "18" }, { "name": "Ted", "age": "20" }]};
var y = x.user.map(user => user.name) // <-- y becomes Array [ "Jhon", "Ted" ]
