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* @license Apache-2.0
*
* Copyright (c) 2025 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 isArray = require( '@stdlib/assert/is-array' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// MAIN //
/**
* Groups the elements of an array according to a specified property name.
*
* @param {Collection} x - input array
* @param {(string|symbol|number)} key - property name whose values are used to determine groups
* @returns {Object} group results
*
* @example
* var x = [
* {
* 'x': 1,
* 'y': 2
* },
* {
* 'x': 1,
* 'y': 3
* }
* ];
*
* var out = groupValuesOnKey( x, 'y' );
* // returns { '2': [ { 'x': 1, 'y': 2 } ], '3': [ { 'x': 1, 'y': 3 } ] }
*/
function groupValuesOnKey( x, key ) {
var get;
var out;
var o;
var v;
var i;
var k;
// Resolve an accessor for retrieving array elements:
get = resolveGetter( x );
// Loop over the elements and assign each to a group...
out = {};
for ( i = 0; i < x.length; i++ ) {
v = get( x, i );
k = v[ key ];
o = out[ k ];
if ( isArray( o ) ) {
o.push( v );
} else {
out[ k ] = [ v ];
}
}
return out;
}
// EXPORTS //
module.exports = groupValuesOnKey;
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