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25 lines
974 B
JavaScript
25 lines
974 B
JavaScript
var baseSlice = require('./baseSlice');
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/**
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* The base implementation of `_.dropRightWhile`, `_.dropWhile`, `_.takeRightWhile`,
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* and `_.takeWhile` without support for callback shorthands and `this` binding.
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*
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* @private
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* @param {Array} array The array to query.
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* @param {Function} predicate The function invoked per iteration.
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* @param {boolean} [isDrop] Specify dropping elements instead of taking them.
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* @param {boolean} [fromRight] Specify iterating from right to left.
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* @returns {Array} Returns the slice of `array`.
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*/
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function baseWhile(array, predicate, isDrop, fromRight) {
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var length = array.length,
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index = fromRight ? length : -1;
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while ((fromRight ? index-- : ++index < length) && predicate(array[index], index, array)) {}
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return isDrop
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? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
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: baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
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}
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module.exports = baseWhile;
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