insert.js•922 B
var _curry3 = require('./internal/_curry3');
var _slice = require('./internal/_slice');
/**
* Inserts the supplied element into the list, at index `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]
*/
module.exports = _curry3(function insert(idx, elt, list) {
idx = idx < list.length && idx >= 0 ? idx : list.length;
var result = _slice(list);
result.splice(idx, 0, elt);
return result;
});