File "move-multiple-items-in-array.ts"
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export function moveMultipleItemsInArray<T>(
array: T[],
indexOrIndexes: number | number[],
newIndex: number
) {
const indexes = Array.isArray(indexOrIndexes)
? indexOrIndexes
: [indexOrIndexes];
const insertBefore = array[newIndex + (newIndex < indexes[0] ? 0 : 1)];
const itemsToBeMoved = indexes.map(i => array[i]);
// in original sequence order, check for presence in the removal
// list, *and* remove them from the original array
const moved = [];
for (let i = 0; i < array.length; ) {
const value = array[i];
if (itemsToBeMoved.indexOf(value) >= 0) {
moved.push(value);
array.splice(i, 1);
} else {
++i;
}
}
// find the new index of the insertion point
let insertionIndex = array.indexOf(insertBefore);
if (insertionIndex < 0) {
insertionIndex = array.length;
}
// and add the elements back in
array.splice(insertionIndex, 0, ...moved);
return array;
}