add new elements to object just using spread

Question

I have an object of states like below code. I want to add many states and cities to it

const stateObject = {
    missouri: ["springfield", "rolla"],
    nevada: ["carlin", "vegas"],
}

const addState = (...state) => {
    return stateObject.push(state);
}

I did not get answer.

How can I create a function to add new state to the object using the spread operator?
How can I create a function to add list of new city to one of state using the spread operator?

any solution would be much appreciated

Why use the spread operator for the first case? To add multiple states at once? — Stuart
– Stuart, Commented Apr 18, 2022 at 9:25

ruleboy21 · Accepted Answer · 2022-04-18 09:37:05Z

3

Try this

const stateObject = {
    missouri: ["springfield", "rolla"],
    nevada: ["carlin", "vegas"],
}

const addState = (...states) => {
    states.forEach(state => stateObject[state] = []);
}

const addCity = (state, ...cities) => {
    stateObject[state] = [...stateObject[state], ...cities];
}

// test
addState('California', 'Texas')
addCity('California', 'Los Angeles')
addCity('Texas', 'Austin', 'Houston')
console.log(stateObject)

answered Apr 18, 2022 at 9:37

ruleboy21

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Comments

Ilijanovic · Accepted Answer · 2022-04-18 09:24:58Z

2

You can do it like this

const stateObject = {
    missouri: ["springfield", "rolla"],
    nevada: ["carlin", "vegas"],
}

const addState = (obj, ...states) => {
    states.forEach(state => obj[state] = [])
}

addState(stateObject, "NewYork", "Washington", "morestates")

console.log(stateObject)

answered Apr 18, 2022 at 9:24

Ilijanovic

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