this is my state
state = {
size: window.innerWidth <= 700 ? (window.innerWidth <= 425 ? 200 : 300) : 400,
positions: [
{ row: 2, col: 5, value: 2, id: 1 },
{ row: 3, col: 2, value: 2, id: 2 },
],
}
this is what i am doing
//let oldPosition = Array.from(this.state.positions); //1 method
//let oldPosition = [...this.state.positions]; //2 method
let oldPosition = this.state.positions.slice(0); //3 method
oldPosition[1].value = 14;
whatever i do among 3 methods i can't prevent the changing of the state
i am trying to make copy of positions and store it in oldPosition but on changing any value from the oldPosition i somehow change the orignal state of my app :(
Appreciate your Help.
In order to clone your array of objects you can create a new array by mapping over the state array and returning each object with a spread.