127 lines
3.4 KiB
JavaScript
127 lines
3.4 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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// MODULES //
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var isObjectLike = require( '@stdlib/assert/is-object-like' );
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var isFunction = require( '@stdlib/assert/is-function' );
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var validate = require( './validate.js' );
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var returnValues = require( './return_values.js' );
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var returnKeys = require( './return_keys.js' );
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var returnPairs = require( './return_pairs.js' );
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// MAIN //
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/**
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* Groups an object's own property values according to an indicator function.
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*
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* @param {(Object|Array|TypedArray)} obj - input object
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* @param {Options} [options] - function options
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* @param {*} [options.thisArg] - execution context
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* @param {string} [options.returns="values"] - if `values`, values are returned; if `keys`, keys are returned; if `*`, both keys and values are returned
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* @param {Function} indicator - indicator function indicating which group an element in the input object belongs to
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* @throws {TypeError} first argument must be an object, array, or typed array
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* @throws {TypeError} options argument must be an object
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* @throws {TypeError} last argument must be a function
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* @throws {TypeError} must provide valid options
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* @returns {Object} group results
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*
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* @example
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* function indicator( v ) {
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* return v[ 0 ];
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* }
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* var obj = {
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* 'a': 'beep',
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* 'b': 'boop',
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* 'c': 'foo',
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* 'd': 'bar'
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* };
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* var out = groupOwn( obj, indicator );
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* // e.g., returns { 'b': [ 'beep', 'boop', 'bar' ], 'f': [ 'foo' ] }
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*
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* @example
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* function indicator( v ) {
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* return v[ 0 ];
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* }
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* var obj = {
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* 'a': 'beep',
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* 'b': 'boop',
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* 'c': 'foo',
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* 'd': 'bar'
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* };
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* var opts = {
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* 'returns': 'keys'
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* };
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* var out = groupOwn( obj, opts, indicator );
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* // e.g., returns { 'b': [ 'a', 'b', 'd' ], 'f': [ 'c' ] }
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*
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* @example
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* function indicator( v ) {
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* return v[ 0 ];
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* }
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* var obj = {
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* 'a': 'beep',
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* 'b': 'boop',
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* 'c': 'foo',
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* 'd': '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 = groupOwn( obj, opts, indicator );
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* // e.g., returns { 'b': [ [ 'a', 'beep' ], [ 'b', 'boop' ], [ 'd', 'bar' ] ], 'f': [ [ 'c', 'foo' ] ] }
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*/
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function groupOwn( obj, options, indicator ) {
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var opts;
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var err;
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var cb;
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if ( !isObjectLike( obj ) ) {
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throw new TypeError( 'invalid argument. First argument must be an object. Value: `'+obj+'`.' );
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}
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opts = {
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'returns': 'values'
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};
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if ( arguments.length === 2 ) {
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cb = options;
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} else {
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err = validate( opts, options );
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if ( err ) {
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throw err;
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}
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cb = indicator;
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}
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if ( !isFunction( cb ) ) {
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throw new TypeError( 'invalid argument. Last argument must be a function. Value: `'+cb+'`.' );
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}
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if ( opts.returns === 'values' ) {
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return returnValues( obj, opts, cb );
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}
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if ( opts.returns === 'keys' ) {
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return returnKeys( obj, opts, cb );
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}
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return returnPairs( obj, opts, cb );
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}
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// EXPORTS //
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module.exports = groupOwn;
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