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56 lines
1.4 KiB
56 lines
1.4 KiB
var castPath = require('./_castPath'), |
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isFunction = require('./isFunction'), |
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toKey = require('./_toKey'); |
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/** |
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* This method is like `_.get` except that if the resolved value is a |
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* function it's invoked with the `this` binding of its parent object and |
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* its result is returned. |
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* |
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* @static |
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* @since 0.1.0 |
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* @memberOf _ |
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* @category Object |
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* @param {Object} object The object to query. |
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* @param {Array|string} path The path of the property to resolve. |
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* @param {*} [defaultValue] The value returned for `undefined` resolved values. |
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* @returns {*} Returns the resolved value. |
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* @example |
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* |
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* var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] }; |
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* |
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* _.result(object, 'a[0].b.c1'); |
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* // => 3 |
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* |
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* _.result(object, 'a[0].b.c2'); |
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* // => 4 |
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* |
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* _.result(object, 'a[0].b.c3', 'default'); |
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* // => 'default' |
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* |
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* _.result(object, 'a[0].b.c3', _.constant('default')); |
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* // => 'default' |
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*/ |
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function result(object, path, defaultValue) { |
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path = castPath(path, object); |
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var index = -1, |
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length = path.length; |
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// Ensure the loop is entered when path is empty. |
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if (!length) { |
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length = 1; |
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object = undefined; |
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} |
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while (++index < length) { |
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var value = object == null ? undefined : object[toKey(path[index])]; |
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if (value === undefined) { |
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index = length; |
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value = defaultValue; |
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} |
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object = isFunction(value) ? value.call(object) : value; |
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} |
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return object; |
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} |
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module.exports = result;
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