Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2025 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 isnan = require( '@stdlib/math/base/assert/is-nan' );
var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
// MAIN //
/**
* Calculates the maximum value of a strided array via a callback function.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Object} x - input array object
* @param {Array<Function>} x.accessors - array element accessors
* @param {integer} stride - stride length
* @param {Callback} clbk - callback
* @param {*} [thisArg] - execution context
* @returns {number} maximum value
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 1.0, 2.0, 2.0, -7.0, -2.0, 3.0, 4.0, 2.0 ];
*
* function accessor( v ) {
* return v * 2.0;
* }
* var v = maxBy( x.length, toAccessorArray( x ), 1, accessor );
*
*/
function maxBy( N, x, stride, clbk, thisArg ) {
var xbuf;
var tmp;
var get;
var max;
var ix;
var v;
var i;
// Cache reference to array data
xbuf = x.data;
// Cache a reference to the element accessor:
get = x.accessors[ 0 ];
if ( N <= 0 ) {
return NaN;
}
if ( N === 1 || stride === 0 ) {
v = clbk.call( thisArg, x[ 0 ], 0, 0, x);
if ( v === void 0 ) {
return NaN;
}
return v;
}
if ( stride < 0 ) {
ix = (1-N) * stride;
} else {
ix = 0;
}
for ( i = 0; i < N; i++) {
tmp = get( xbuf, ix );
max = clbk.call( thisArg, tmp, i, ix, x);
if ( max !== void 0 ) {
break;
}
ix += stride;
}
if ( i === N) {
return NaN;
}
i += 1;
for ( i; i < N; i++) {
ix += stride;
tmp = get( xbuf, ix );
v = clbk.call( thisArg, tmp, i, ix, x );
if ( v === void 0 ) {
continue;
}
if ( isnan(v) ) {
return v;
}
if ( v > max || ( v === max && isPositiveZero( v ))) {
max = v;
}
}
return max;
}
// EXPORTS //
module.exports = maxBy;
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