74 lines
1.7 KiB
JavaScript
74 lines
1.7 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/**
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* Group values according to an indicator function.
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*
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* @module @stdlib/utils/group-by
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*
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* @example
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* var groupBy = require( '@stdlib/utils/group-by' );
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*
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* function indicator( v ) {
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* return v[ 0 ];
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* }
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* var arr = [ 'beep', 'boop', 'foo', 'bar' ];
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*
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* var out = groupBy( arr, indicator );
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* // returns { 'b': [ 'beep', 'boop', 'bar' ], 'f': [ 'foo' ] }
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*
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* @example
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* var groupBy = require( '@stdlib/utils/group-by' );
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*
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* function indicator( v ) {
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* return v[ 0 ];
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* }
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* var arr = [ 'beep', 'boop', 'foo', 'bar' ];
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*
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* var opts = {
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* 'returns': 'indices'
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* };
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* var out = groupBy( arr, opts, indicator );
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* // returns { 'b': [ 0, 1, 3 ], 'f': [ 2 ] }
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*
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* @example
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* var groupBy = require( '@stdlib/utils/group-by' );
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*
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* function indicator( v ) {
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* return v[ 0 ];
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* }
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* var arr = [ 'beep', 'boop', 'foo', 'bar' ];
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*
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* var opts = {
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* 'returns': '*'
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* };
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* var out = groupBy( arr, opts, indicator );
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* // returns { 'b': [ [ 0, 'beep' ], [ 1, 'boop' ], [ 3, 'bar' ] ], 'f': [ [ 2, 'foo' ] ] }
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*/
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// MODULES //
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var groupBy = require( './group_by.js' );
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// EXPORTS //
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module.exports = groupBy;
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