70 lines
1.7 KiB
JavaScript
70 lines
1.7 KiB
JavaScript
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var baseWrapperValue = require('./_baseWrapperValue'),
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getView = require('./_getView'),
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isArray = require('./isArray');
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/** Used to indicate the type of lazy iteratees. */
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var LAZY_FILTER_FLAG = 1,
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LAZY_MAP_FLAG = 2;
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeMin = Math.min;
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/**
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* Extracts the unwrapped value from its lazy wrapper.
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*
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* @private
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* @name value
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* @memberOf LazyWrapper
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* @returns {*} Returns the unwrapped value.
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*/
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function lazyValue() {
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var array = this.__wrapped__.value(),
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dir = this.__dir__,
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isArr = isArray(array),
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isRight = dir < 0,
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arrLength = isArr ? array.length : 0,
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view = getView(0, arrLength, this.__views__),
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start = view.start,
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end = view.end,
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length = end - start,
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index = isRight ? end : (start - 1),
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iteratees = this.__iteratees__,
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iterLength = iteratees.length,
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resIndex = 0,
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takeCount = nativeMin(length, this.__takeCount__);
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if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
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return baseWrapperValue(array, this.__actions__);
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}
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var result = [];
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outer:
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while (length-- && resIndex < takeCount) {
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index += dir;
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var iterIndex = -1,
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value = array[index];
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while (++iterIndex < iterLength) {
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var data = iteratees[iterIndex],
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iteratee = data.iteratee,
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type = data.type,
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computed = iteratee(value);
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if (type == LAZY_MAP_FLAG) {
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value = computed;
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} else if (!computed) {
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if (type == LAZY_FILTER_FLAG) {
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continue outer;
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} else {
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break outer;
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}
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}
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}
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result[resIndex++] = value;
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}
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return result;
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}
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module.exports = lazyValue;
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