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x/ramda/insert.js

:ram: Practical functional Javascript
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import _curry3 from './internal/_curry3';

/** * Inserts the supplied element into the list, at the specified `index`. _Note that
* this is not destructive_: it returns a copy of the list with the changes. * <small>No lists have been harmed in the application of this function.</small> * * @func * @memberOf R * @since v0.2.2 * @category List * @sig Number -> a -> [a] -> [a] * @param {Number} index The position to insert the element * @param {*} elt The element to insert into the Array * @param {Array} list The list to insert into * @return {Array} A new Array with `elt` inserted at `index`. * @example * * R.insert(2, 'x', [1,2,3,4]); //=> [1,2,'x',3,4] */var insert = _curry3(function insert(idx, elt, list) { idx = idx < list.length && idx >= 0 ? idx : list.length; var result = Array.prototype.slice.call(list, 0); result.splice(idx, 0, elt); return result;});export default insert;