var baseSlice = require('./_baseSlice');

/**

* The base implementation of methods like `_.dropWhile` and `_.takeWhile`
* without support for iteratee shorthands.
*
* @private
* @param {Array} array The array to query.
* @param {Function} predicate The function invoked per iteration.
* @param {boolean} [isDrop] Specify dropping elements instead of taking them.
* @param {boolean} [fromRight] Specify iterating from right to left.
* @returns {Array} Returns the slice of `array`.
*/

function baseWhile(array, predicate, isDrop, fromRight) {

var length = array.length,
    index = fromRight ? length : -1;

while ((fromRight ? index-- : ++index < length) &&
  predicate(array[index], index, array)) {}

return isDrop
  ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
  : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));

}

module.exports = baseWhile;