How to Remove Items from React State Without Leaving Gaps?

Removing Items from React State

The question pertains to removing an item, such as "Bob," from an array within React's state. The challenge arises from the imperative to preserve the array's integrity without leaving any vacancies.

Previously, the attempt to delete Bob manually using delete mutation failed. Instead, a solution that adheres to React's principles is recommended.

Immutable Array Manipulation

React prohibits direct manipulation of state values. To change an array within state, a new copy must be created.

Array.prototype.filter()

The most straightforward approach is to leverage Array.prototype.filter() to construct a new array omitting the item to be removed. For example:

removePeople(e) {
  this.setState({people: this.state.people.filter(function(person) {
    return person !== e.target.value;
  })});
}

This code crafts a new array by iterating through each element in this.state.people. If the name is not equal to the item to be removed (e.g., "Bob"), it's retained in the new array.

Conclusion

Utilizing filter() ensures state immutability and maintains the integrity of the array, eliminating any empty slots left behind by deletion.

The above is the detailed content of How to Remove Items from React State Without Leaving Gaps?. For more information, please follow other related articles on the PHP Chinese website!