Okay, so I was playing around with the Context Api

Question

Okay, so I was playing around with the Context Api

in React and I wrote a reducer function like this

const reducer = (state, action) =>{
switch(action.type){
case "ADD_CONTACT": return {
...state,
contacts: state.contacts.push(action.payload)
}
}

}

Now I know the mistake I did, since I'm trying to add something new to something that is immutable but my doubt is, after this, state.contacts contains the value 4 (there were 3 hardcoded existing contacts)

How does that happen?

0

17.09.2018

3 ответов

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Edwin Vargas

Spread operator it's your friend

0

17.09.2018

Thomas

push doesn't return the array it pushes to, try this instead: contacts: [ ...state.contacts, action.payload ]

0

17.09.2018

ＭＵＴＨＵ・ＫＵＭＡＲ「メーカー」 🔺 · Accepted Answer

ＭＵＴＨＵ・ＫＵＭＡＲ「メーカー」 🔺

Redux state is not immutable by itself, you have to do that yourself

0

17.09.2018

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Okay, so I was playing around with the Context Api

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