blob: c24e9bd9d9c9ff34ea6c78281247b7b5aed0381f [file] [log] [blame]
var baseSlice = require('./baseSlice');
/**
* The base implementation of `_.dropRightWhile`, `_.dropWhile`, `_.takeRightWhile`,
* and `_.takeWhile` without support for callback shorthands and `this` binding.
*
* @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;