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* @license Apache-2.0
*
* Copyright (c) 2018 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 isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var format = require( '@stdlib/string/format' );
var PINF = require( '@stdlib/constants/float64/pinf' );
var deepCopy = require( './deep_copy.js' );
// MAIN //
/**
* Copies or deep clones a value to an arbitrary depth.
*
* @param {*} value - value to copy
* @param {NonNegativeInteger} [level=+infinity] - copy depth
* @throws {TypeError} second argument must be a nonnegative integer
* @returns {*} value copy
*
* @example
* var out = copy( 'beep' );
* // returns 'beep'
*
* @example
* var value = [
* {
* 'a': 1,
* 'b': true,
* 'c': [ 1, 2, 3 ]
* }
* ];
* var out = copy( value );
* // returns [ { 'a': 1, 'b': true, 'c': [ 1, 2, 3 ] } ]
*
* var bool = ( value[0].c === out[0].c );
* // returns false
*/
function copy( value, level ) {
var out;
if ( arguments.length > 1 ) {
if ( !isNonNegativeInteger( level ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer. Value: `%s`.', level ) );
}
if ( level === 0 ) {
return value;
}
} else {
level = PINF;
}
out = ( isArray( value ) ) ? new Array( value.length ) : {}; // eslint-disable-line stdlib/no-new-array
return deepCopy( value, out, [value], [out], level );
}
// EXPORTS //
module.exports = copy;
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