typescript-immutable-utils/es/arrays.js

Type-safe immutability helpers for simple objects and arrays

export function setAt(items, index, item) {
    if (items[index] === item)
        return items;
    var newItems = items.slice();
    newItems[index] = item;
    return newItems;
}
export function insertAt(items, index, item) {
    var newItems = items.slice();
    newItems.splice(index, 0, item);
    return newItems;
}
export function removeAt(items, index) {
    var newItems = items.slice();
    var deleted = newItems.splice(index, 1);
    return deleted.length === 0 ? items : newItems;
}
export function removeValue(items, item) {
    var index = items.indexOf(item);
    return index === -1 ? items : removeAt(items, index);
}