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122 lines
3.2 KiB
JavaScript
122 lines
3.2 KiB
JavaScript
/**
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* lodash (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var baseFor = require('lodash._basefor'),
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keys = require('lodash.keys');
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/**
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* The base implementation of `_.forOwn` without support for iteratee shorthands.
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*
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* @private
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* @param {Object} object The object to iterate over.
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* @param {Function} iteratee The function invoked per iteration.
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* @returns {Object} Returns `object`.
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*/
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function baseForOwn(object, iteratee) {
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return object && baseFor(object, iteratee, keys);
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}
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/**
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* The base implementation of `_.invert` and `_.invertBy` which inverts
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* `object` with values transformed by `iteratee` and set by `setter`.
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*
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* @private
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* @param {Object} object The object to iterate over.
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* @param {Function} setter The function to set `accumulator` values.
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* @param {Function} iteratee The iteratee to transform values.
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* @param {Object} accumulator The initial inverted object.
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* @returns {Function} Returns `accumulator`.
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*/
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function baseInverter(object, setter, iteratee, accumulator) {
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baseForOwn(object, function(value, key, object) {
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setter(accumulator, iteratee(value), key, object);
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});
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return accumulator;
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}
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/**
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* Creates a function like `_.invertBy`.
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*
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* @private
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* @param {Function} setter The function to set accumulator values.
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* @param {Function} toIteratee The function to resolve iteratees.
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* @returns {Function} Returns the new inverter function.
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*/
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function createInverter(setter, toIteratee) {
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return function(object, iteratee) {
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return baseInverter(object, setter, toIteratee(iteratee), {});
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};
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}
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/**
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* Creates an object composed of the inverted keys and values of `object`.
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* If `object` contains duplicate values, subsequent values overwrite
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* property assignments of previous values.
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*
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* @static
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* @memberOf _
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* @since 0.7.0
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* @category Object
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* @param {Object} object The object to invert.
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* @returns {Object} Returns the new inverted object.
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* @example
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*
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* var object = { 'a': 1, 'b': 2, 'c': 1 };
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*
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* _.invert(object);
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* // => { '1': 'c', '2': 'b' }
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*/
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var invert = createInverter(function(result, value, key) {
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result[value] = key;
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}, constant(identity));
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/**
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* Creates a function that returns `value`.
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*
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* @static
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* @memberOf _
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* @since 2.4.0
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* @category Util
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* @param {*} value The value to return from the new function.
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* @returns {Function} Returns the new constant function.
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* @example
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*
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* var object = { 'user': 'fred' };
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* var getter = _.constant(object);
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*
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* getter() === object;
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* // => true
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*/
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function constant(value) {
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return function() {
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return value;
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};
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}
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/**
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* This method returns the first argument given to it.
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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 Util
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* @param {*} value Any value.
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* @returns {*} Returns `value`.
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* @example
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*
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* var object = { 'user': 'fred' };
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*
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* _.identity(object) === object;
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* // => true
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*/
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function identity(value) {
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return value;
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}
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module.exports = invert;
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