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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';
// MODULES //
var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var isInfinitef = require( '@stdlib/math/base/assert/is-infinitef' );
var floorf = require( '@stdlib/math/base/special/floorf' );
var powf = require( '@stdlib/math/base/special/powf' );
var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );
var abs = require( '@stdlib/math/base/special/abs' );
var log10 = require( '@stdlib/math/base/special/log10' );
// MAIN //
/**
* Rounds a numeric value to the nearest power of `10` on a linear scale (single-precision).
*
* @param {number} x - input value
* @returns {number} rounded value (float32)
*
* @example
* var v = round10f( 3.1415926 );
* // returns 1.0
*
* @example
* var v = round10f( 123.45 );
* // returns 100.0
*
* @example
* var v = round10f( -2.5 );
* // returns -1.0
*
* @example
* var v = round10f( -0.0 );
* // returns -0.0
*/
function round10f( x ) {
var ax;
var e0;
var e1;
var y0;
var y1;
// Force float32:
x = toFloat32( x );
// Handle specials:
if ( isnanf( x ) || isInfinitef( x ) || x === 0.0 ) {
return x;
}
// Abs(x):
ax = toFloat32( abs( x ) );
// Lower exponent:
e0 = floorf( log10( ax ) );
// Next exponent:
e1 = e0 + 1;
// Compute two powers:
y0 = powf( 10.0, e0 );
y1 = powf( 10.0, e1 );
// Return whichever is closer:
if ( (ax - y0) <= (y1 - ax) ) {
return toFloat32( ( x < 0.0 ) ? -y0 : y0 );
}
return toFloat32( ( x < 0.0 ) ? -y1 : y1 );
}
// EXPORTS //
module.exports = round10f;
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