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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
// MAIN //
/**
* Groups values according to an indicator function and outputs results as keys.
*
* @private
* @param {(Object|Array|TypedArray)} obj - input object
* @param {Options} opts - function options
* @param {*} [opts.thisArg] - execution context
* @param {Function} indicator - indicator function specifying which group an element in the input object belongs to
* @returns {Object} results
*
* @example
* function indicator( v ) {
* return v[ 0 ];
* }
* var obj = {
* 'a': 'beep',
* 'b': 'boop',
* 'c': 'foo',
* 'd': 'bar'
* };
* var out = groupOwn( obj, {}, indicator );
* // e.g., returns { 'b': [ 'a', 'b', 'd' ], 'f': [ 'c' ] }
*/
function groupOwn( obj, opts, indicator ) {
var thisArg;
var out;
var key;
var g;
thisArg = opts.thisArg;
out = {};
for ( key in obj ) {
if ( hasOwnProp( obj, key ) ) {
g = indicator.call( thisArg, obj[ key ], key );
if ( hasOwnProp( out, g ) ) {
out[ g ].push( key );
} else {
out[ g ] = [ key ];
}
}
}
return out;
}
// EXPORTS //
module.exports = groupOwn;
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