从组件状态的数组中删除元素

Removing element from array in component state(从组件状态的数组中删除元素)

问题描述

I am trying to find the best way to remove an element from an array in the state of a component. Since I should not modify the this.state variable directly, is there a better way (more concise) to remove an element from an array than what I have here?:

  onRemovePerson: function(index) {
    this.setState(prevState => { // pass callback in setState to avoid race condition
      let newData = prevState.data.slice() //copy array from prevState
      newData.splice(index, 1) // remove element
      return {data: newData} // update state
    })
  },

Thank you.

updated

This has been updated to use the callback in setState. This should be done when referencing the current state while updating it.

The cleanest way to do this that I've seen is with filter:

removeItem(index) {
  this.setState({
    data: this.state.data.filter((_, i) => i !== index)
  });
}

这篇关于从组件状态的数组中删除元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！