A setState function to immutably splice an array property

setStateArraySplice.js

// Thanks to https://vincent.billey.me/pure-javascript-immutable-array

import React, { Component } from 'react';

const setStateArraySplice = (
  stateKey, 
  arrayStart, 
  arrayDeleteCount,
  ...items
) => ({
  [stateKey]: array,
}) => ({
  [stateKey]: [
    ...array.slice(0, arrayStart),
    ...items,
    ...array.slice(arrayStart + arrayDeleteCount),
  ],
});

class extends Component {
  state = { prop: [true, true, false] };
  
  componentDidMount() {
    this.setState(setStateArraySplice('prop', 2, 1, true));
    // state = { prop: [true, true, true] };
  }

  render = () => false;
}