insertAll.js•1.01 kB
var _concat = require('./internal/_concat');
var _curry3 = require('./internal/_curry3');
var _slice = require('./internal/_slice');
/**
* Inserts the sub-list 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 v0.9.0
* @category List
* @sig Number -> [a] -> [a] -> [a]
* @param {Number} index The position to insert the sub-list
* @param {Array} elts The sub-list to insert into the Array
* @param {Array} list The list to insert the sub-list into
* @return {Array} A new Array with `elts` inserted starting at `index`.
* @example
*
* R.insertAll(2, ['x','y','z'], [1,2,3,4]); //=> [1,2,'x','y','z',3,4]
*/
module.exports = _curry3(function insertAll(idx, elts, list) {
idx = idx < list.length && idx >= 0 ? idx : list.length;
return _concat(_concat(_slice(list, 0, idx), elts), _slice(list, idx));
});