append to state array react code example
Example 1: how to add array data on state react
this.setState({ myArray: [...this.state.myArray, 'new value'] })
this.setState({ myArray: [...this.state.myArray, ...[1,2,3] ] })
Example 2: how to update array in react state
this.setState(prevState => ({
arrayvar: [...prevState.arrayvar, newelement]
}))
Example 3: add new array at the back of react state
this.setState(prevState => ({
myArray: ["new value", ...prevState.myArray]
}))
Example 4: react native update state array of objects
let newMarkers = markers.map(el => (
el.name==='name'? {...el, key: value}: el
))
this.setState({ markers });
Example 5: add new array at the back of react state
this.setState(prevState => ({
myArray: [...prevState.myArray, {"name": "object"}]
}))
Example 6: add new array at the back of react state
this.setState(prevState => ({
myArray: [ {"name": "object"}, ...prevState.myArray]
}))