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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 element entries according to an indicator function.
*
* @param {Collection} x - input array
* @param {Function} indicator - indicator function specifying which group an element in the input collection belongs to
* @param {*} [thisArg] - indicator function execution context
* @returns {Object} group results
*
* @example
* function indicator( v ) {
* return v[ 0 ];
* }
*
* var x = [ 'beep', 'boop', 'foo', 'bar' ];
*
* var out = groupEntriesBy( x, indicator );
* // returns { 'b': [ [ 0, 'beep' ], [ 1, 'boop' ], [ 3, 'bar' ] ], 'f': [ [ 2, 'foo' ] ] }
*/
function groupEntriesBy( x, indicator, thisArg ) {
var get;
var len;
var out;
var g;
var o;
var v;
var i;
// Get the number of elements to group:
len = x.length;
// 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 < len; i++ ) {
v = get( x, i );
g = indicator.call( thisArg, v, i, x );
o = out[ g ];
if ( isArray( o ) ) {
o.push( [ i, v ] );
} else {
out[ g ] = [ [ i, v ] ];
}
}
return out;
}
// EXPORTS //
module.exports = groupEntriesBy;
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