CODEWITHSUNDEEP
javascriptreactjsreact-native
Dres
Dres

Reputation: 1499

Having trouble writing a function that adds items to different arrays in state

I'm trying to create a function that allows me to add items to an array in the local state. I could create several functions that cater to each array in the state, but I feel like I should be able to only need one function that does this. The way I'm doing it isn't working. I probably need to take a step back and reconsider but I was hoping to find some way to make this work.

Thanks!

this.state = {
  category1: [],
  category2: []
}

addItem(category, type){
  this.setState({
    category: [...this.state.category, type]
  })
}

listsOfItems.types.map((type, i) => (
  <ListItem 
    onPress={ () => this.addItem(category1, type)}
  />
))

listOfOtherItems.types.map((type, i) => {
  <ListItem
    onPress={ () => this.addItem(category2, type)}
  />
})

Upvotes: 1

Views: 38

Answers (1)

Tholle
Tholle

Reputation: 112787

I don't think repetition in this case is that bad, but if you really want to generalize it, you could use a computed property name:

this.state = {
  category1: [],
  category2: []
}

addItem(category, type){
  this.setState({
    [category]: [...this.state[category], type]
  })
}

listsOfItems.types.map((type, i) => (
  <ListItem 
    onPress={ () => this.addItem('category1', type)}
  />
))

listOfOtherItems.types.map((type, i) => {
  <ListItem
    onPress={ () => this.addItem('category2', type)}
  />
})

Upvotes: 1

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