dropWhile.js•1.26 kB
var _curry2 = require('./internal/_curry2');
var _dispatchable = require('./internal/_dispatchable');
var _slice = require('./internal/_slice');
var _xdropWhile = require('./internal/_xdropWhile');
/**
* Returns a new list containing the last `n` elements of a given list, passing
* each value to the supplied predicate function, skipping elements while the
* predicate function returns `true`. The predicate function is passed one
* argument: *(value)*.
*
* Dispatches to the `dropWhile` method of the second argument, if present.
*
* Acts as a transducer if a transformer is given in list position.
*
* @func
* @memberOf R
* @since v0.9.0
* @category List
* @sig (a -> Boolean) -> [a] -> [a]
* @param {Function} fn The function called per iteration.
* @param {Array} list The collection to iterate over.
* @return {Array} A new array.
* @see R.takeWhile, R.transduce, R.addIndex
* @example
*
* var lteTwo = x => x <= 2;
*
* R.dropWhile(lteTwo, [1, 2, 3, 4, 3, 2, 1]); //=> [3, 4, 3, 2, 1]
*/
module.exports = _curry2(_dispatchable('dropWhile', _xdropWhile, function dropWhile(pred, list) {
var idx = 0;
var len = list.length;
while (idx < len && pred(list[idx])) {
idx += 1;
}
return _slice(list, idx);
}));