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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 resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// MAIN //
/**
* Splits element indices into two groups according to a predicate function.
*
* @param {Collection} x - input array
* @param {Function} predicate - predicate function specifying which group an element in the input collection belongs to
* @param {*} [thisArg] - predicate function execution context
* @returns {Object} group results
*
* @example
* function predicate( v ) {
* return v[ 0 ] === 'b';
* }
*
* var x = [ 'beep', 'boop', 'foo', 'bar' ];
*
* var out = bifurcateIndicesBy( x, predicate );
* // returns [ [ 0, 1, 3 ], [ 2 ] ]
*/
function bifurcateIndicesBy( x, predicate, thisArg ) {
var get;
var len;
var out;
var i;
// Get the number of elements to group:
len = x.length;
if ( len === 0 ) {
return [];
}
// 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++ ) {
if ( predicate.call( thisArg, get( x, i ), i, x ) ) {
out[ 0 ].push( i );
} else {
out[ 1 ].push( i );
}
}
return out;
}
// EXPORTS //
module.exports = bifurcateIndicesBy;
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