71 lines
1.6 KiB
JavaScript
71 lines
1.6 KiB
JavaScript
/**
|
|
* @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( './../../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;
|