82 lines
2.0 KiB
JavaScript
82 lines
2.0 KiB
JavaScript
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/**
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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 copy = require( './../../copy' );
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var isArray = require( '@stdlib/assert/is-array' );
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var defaults = require( './defaults.js' );
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var validate = require( './validate.js' );
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var recurse = require( './recurse.js' );
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// MAIN //
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/**
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* Flattens an array.
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*
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* @param {Array} arr - input array
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* @param {Options} [options] - function options
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* @param {NonNegativeInteger} [options.depth] - maximum depth to flatten
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* @param {boolean} [options.copy=false] - boolean indicating whether to deep copy array elements
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* @throws {TypeError} first argument must be an array
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* @throws {TypeError} options argument must be an object
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* @throws {TypeError} must provide valid options
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* @returns {Array} flattened array
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*
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* @example
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* var arr = [ 1, [2, [3, [4, [ 5 ], 6], 7], 8], 9 ];
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*
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* var out = flattenArray( arr );
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* // returns [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]
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*/
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function flattenArray( arr, options ) {
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var opts;
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var err;
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var out;
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if ( !isArray( arr ) ) {
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throw new TypeError( 'invalid argument. First argument must be an array. Value: `' + arr + '`.' );
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}
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opts = {
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'copy': defaults.copy,
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'depth': defaults.depth
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};
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if ( arguments.length > 1 ) {
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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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}
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if ( opts.depth === 0 ) {
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out = arr;
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} else {
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out = recurse( [], arr, opts.depth );
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}
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if ( opts.copy ) {
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return copy( out );
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}
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return out;
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}
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// EXPORTS //
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module.exports = flattenArray;
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