moving-item-imm-helper.js

const update = require('immutability-helper');

const items = [
  {key: 'IT-1', title: 'Dummy Item 1'},
  {key: 'IT-2', title: 'Dummy Item 2'},
  {key: 'IT-3', title: 'Dummy Item 3'},
  {key: 'IT-4', title: 'Dummy Item 4'},
  {key: 'IT-5', title: 'Dummy Item 5'},
  {key: 'IT-6', title: 'Dummy Item 6'}
];


function rearrangeItems(items, moveFromIndex, moveToIndex) {

    const movingItem = items[moveFromIndex];
    const arrangedArray = update(items, {$splice: [
                                            [moveFromIndex, 1],
                                            [moveToIndex, 0, movingItem]        
                                        ]});

    return arrangedArray;
}

const arrangedArray = rearrangeItems(items, 2, 0);

console.log('Rearranged Items : ', JSON.stringify(arrangedArray));

function rearrangeItems(items, moveFromIndex, moveToIndex) {
	const copy = [...items]; // const copy = items.slice();
	const [movingItem] = copy.splice(moveFromIndex, 1);
	copy.splice(moveToIndex, 0, movingItem);

	return copy;
}

-const update = require('immutability-helper');