/
insertAll.js
30 lines (28 loc) · 1005 Bytes
/
insertAll.js
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import _curry3 from './internal/_curry3';
/**
* Inserts the sub-list 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 v0.9.0
* @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]
*/
var insertAll = _curry3(function insertAll(idx, elts, list) {
idx = idx < list.length && idx >= 0 ? idx : list.length;
return [].concat(
Array.prototype.slice.call(list, 0, idx),
elts,
Array.prototype.slice.call(list, idx)
);
});
export default insertAll;