lodash/.internal/baseWhile.js

import slice from '../slice.js'

/**
 * The base implementation of methods like `dropWhile` and `takeWhile`.
 *
 * @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) {
  const { length } = array
  let index = fromRight ? length : -1

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

  return isDrop
    ? slice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
    : slice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index))
}

export default baseWhile