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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 isObjectLike = require( '@stdlib/assert/is-object-like' );
// MAIN //
/**
* Tests if a value is a Buffer instance.
*
* @param {*} value - value to validate
* @returns {boolean} boolean indicating if a value is a Buffer instance
*
* @example
* var v = isBuffer( new Buffer( 'beep' ) );
* // returns true
*
* @example
* var v = isBuffer( new Buffer( [1,2,3,4] ) );
* // returns true
*
* @example
* var v = isBuffer( {} );
* // returns false
*
* @example
* var v = isBuffer( [] );
* // returns false
*/
function isBuffer( value ) {
return (
isObjectLike( value ) &&
(
// eslint-disable-next-line no-underscore-dangle
value._isBuffer || // for envs missing Object.prototype.constructor (e.g., Safari 5-7)
(
value.constructor &&
// WARNING: `typeof` is not a foolproof check, as certain envs consider RegExp and NodeList instances to be functions
typeof value.constructor.isBuffer === 'function' &&
value.constructor.isBuffer( value )
)
)
);
}
// EXPORTS //
module.exports = isBuffer;
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