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48 行
1.3 KiB
48 行
1.3 KiB
var LazyWrapper = require('./_LazyWrapper'),
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LodashWrapper = require('./_LodashWrapper'),
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baseAt = require('./_baseAt'),
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flatRest = require('./_flatRest'),
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isIndex = require('./_isIndex'),
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thru = require('./thru');
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/**
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* This method is the wrapper version of `_.at`.
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*
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* @name at
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* @memberOf _
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* @since 1.0.0
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* @category Seq
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* @param {...(string|string[])} [paths] The property paths to pick.
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* @returns {Object} Returns the new `lodash` wrapper instance.
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* @example
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*
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* var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
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*
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* _(object).at(['a[0].b.c', 'a[1]']).value();
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* // => [3, 4]
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*/
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var wrapperAt = flatRest(function(paths) {
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var length = paths.length,
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start = length ? paths[0] : 0,
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value = this.__wrapped__,
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interceptor = function(object) { return baseAt(object, paths); };
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if (length > 1 || this.__actions__.length ||
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!(value instanceof LazyWrapper) || !isIndex(start)) {
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return this.thru(interceptor);
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}
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value = value.slice(start, +start + (length ? 1 : 0));
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value.__actions__.push({
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'func': thru,
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'args': [interceptor],
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'thisArg': undefined
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});
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return new LodashWrapper(value, this.__chain__).thru(function(array) {
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if (length && !array.length) {
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array.push(undefined);
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}
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return array;
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});
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});
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module.exports = wrapperAt;
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