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* @license Apache-2.0
*
* Copyright (c) 2023 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 elements as arrays associated with distinct keys.
*
* @param {Collection} x - input array
* @param {Collection} groups - array defining which group an element in the input array belongs to
* @throws {RangeError} must provide arrays having the same length
* @returns {Object} group results
*
* @example
* var x = [ 'beep', 'boop', 'foo', 'bar' ];
* var groups = [ 'b', 'b', 'f', 'b' ];
*
* var out = groupValues( x, groups );
* // returns { 'b': [ 'beep', 'boop', 'bar' ], 'f': [ 'foo' ] }
*/
function groupValues( x, groups ) {
var xget;
var gget;
var len;
var out;
var g;
var o;
var v;
var i;
// Get the number of elements to group:
len = x.length;
if ( groups.length !== len ) {
throw new RangeError( 'invalid argument. The first and second arguments must have the same length.' );
}
// Resolve accessors for retrieving array elements:
xget = resolveGetter( x );
gget = resolveGetter( groups );
// Loop over the elements and assign each to a group...
out = {};
for ( i = 0; i < len; i++ ) {
v = xget( x, i );
g = gget( groups, i ).toString();
o = out[ g ];
if ( isArray( o ) ) {
o.push( v );
} else {
out[ g ] = [ v ];
}
}
return out;
}
// EXPORTS //
module.exports = groupValues;
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