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