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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 ctorName = require( '@stdlib/utils/constructor-name' );
// NOTES //
/*
* Built-in `typeof` operator behavior:
*
* ```text
* typeof null => 'object'
* typeof undefined => 'undefined'
* typeof 'a' => 'string'
* typeof 5 => 'number'
* typeof NaN => 'number'
* typeof true => 'boolean'
* typeof false => 'boolean'
* typeof {} => 'object'
* typeof [] => 'object'
* typeof function foo(){} => 'function'
* typeof function* foo(){} => 'object'
* typeof Symbol() => 'symbol'
* ```
*
*/
// MAIN //
/**
* Determines a value's type.
*
* @param {*} v - input value
* @returns {string} string indicating the value's type
*/
function typeOf( v ) {
var type;
// Address `typeof null` => `object` (see http://wiki.ecmascript.org/doku.php?id=harmony:typeof_null):
if ( v === null ) {
return 'null';
}
type = typeof v;
// If the `typeof` operator returned something other than `object`, we are done. Otherwise, we need to check for an internal class name or search for a constructor.
if ( type === 'object' ) {
return ctorName( v ).toLowerCase();
}
return type;
}
// EXPORTS //
module.exports = typeOf;
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