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* @license Apache-2.0
*
* Copyright (c) 2026 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';
// MAIN //
/**
* Tests if two half-precision floating-point numbers are the same value.
*
* ## Notes
*
* - The function implements the [SameValue Algorithm][ecma-262-same-value-algorithm], as specified in ECMAScript 5.
* - In contrast to the strict equality operator `===`, `-0` and `+0` are distinguishable and `NaNs` are the same.
*
* [ecma-262-same-value-algorithm]: http://ecma-international.org/ecma-262/5.1/#sec-9.12
*
* @param {number} a - first input value
* @param {number} b - second input value
* @returns {boolean} boolean indicating whether two half-precision floating-point numbers are the same value
*
* @example
* var bool = isSameValue( 3.14, 3.14 );
* // returns true
*
* @example
* var bool = isSameValue( -0.0, -0.0 );
* // returns true
*
* @example
* var bool = isSameValue( -0.0, 0.0 );
* // returns false
*
* @example
* var bool = isSameValue( NaN, NaN );
* // returns true
*/
function isSameValue( a, b ) {
if ( a === b ) {
if ( a === 0.0 ) {
return 1.0 / a === 1.0 / b; // handles +-0
}
return true;
}
return ( a !== a && b !== b ); // handles NaNs
}
// EXPORTS //
module.exports = isSameValue;
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