2.7 KiB
2.7 KiB
id | title | challengeType | isRequired | videoUrl | localeTitle |
---|---|---|---|---|---|
5a24c314108439a4d403615a | Remove an Item from an Array | 6 | false | Remover um item de uma matriz |
Description
slice()
e concat()
. Instructions
Tests
tests:
- text: 'O repositório Redux deve existir e inicializar com um estado igual a <code>[0,1,2,3,4,5]</code>'
testString: 'assert((function() { const initialState = store.getState(); return (Array.isArray(initialState) === true && DeepEqual(initialState, [0, 1, 2, 3, 4, 5])); })(), "The Redux store should exist and initialize with a state equal to <code>[0,1,2,3,4,5]</code>");'
- text: <code>removeItem</code> e <code>immutableReducer</code> ambos devem ser funções.
testString: 'assert(typeof removeItem === "function" && typeof immutableReducer === "function", "<code>removeItem</code> and <code>immutableReducer</code> both should be functions.");'
- text: Despachar o criador da ação <code>removeItem</code> deve remover itens do estado e NÃO deve alterar o estado.
testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(removeItem(3)); const state_1 = store.getState(); store.dispatch(removeItem(2)); const state_2 = store.getState(); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); const state_3 = store.getState(); return isFrozen && DeepEqual(state_1, [0, 1, 2, 4, 5]) && DeepEqual(state_2, [0, 1, 4, 5]) && DeepEqual(state_3, [5]); })(), "Dispatching the <code>removeItem</code> action creator should remove items from the state and should NOT mutate state.");'
Challenge Seed
const immutableReducer = (state = [0,1,2,3,4,5], action) => {
switch(action.type) {
case 'REMOVE_ITEM':
// don't mutate state here or the tests will fail
return
default:
return state;
}
};
const removeItem = (index) => {
return {
type: 'REMOVE_ITEM',
index
}
}
const store = Redux.createStore(immutableReducer);
Solution
// solution required