forked from zhurui/management
57 lines
1.4 KiB
JavaScript
57 lines
1.4 KiB
JavaScript
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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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