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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';
// MAIN //
/**
* Counts the number of elements in an ndarray which pass a test implemented by a predicate function.
*
* @private
* @param {Object} x - object containing ndarray meta data
* @param {ndarrayLike} x.ref - reference to the original ndarray-like object
* @param {*} x.dtype - data type
* @param {Collection} x.data - data buffer
* @param {NonNegativeIntegerArray} x.shape - dimensions
* @param {IntegerArray} x.strides - stride lengths
* @param {NonNegativeInteger} x.offset - index offset
* @param {string} x.order - specifies whether `x` is row-major (C-style) or column-major (Fortran-style)
* @param {Function} predicate - predicate function
* @param {*} thisArg - predicate function execution context
* @returns {integer} result
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* function predicate( value ) {
* return value > 0.0;
* }
*
* // Create a data buffer:
* var xbuf = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 0.0, 7.0, 8.0 ] );
*
* // Define the shape of the input array:
* var shape = [ 4 ];
*
* // Define the array strides:
* var sx = [ 2 ];
*
* // Define the index offset:
* var ox = 1;
*
* // Create the input ndarray-like object:
* var x = {
* 'ref': null,
* 'dtype': 'float64',
* 'data': xbuf,
* 'shape': shape,
* 'strides': sx,
* 'offset': ox,
* 'order': 'row-major'
* };
*
* // Perform operation:
* var out = countIf1d( x, predicate );
* // returns 3
*/
function countIf1d( x, predicate, thisArg ) {
var count;
var xbuf;
var dx0;
var S0;
var ix;
var i0;
// Note on variable naming convention: S#, dx#, i# where # corresponds to the loop number, with `0` being the innermost loop...
// Extract loop variables: dimensions and loop offset (pointer) increments:
S0 = x.shape[ 0 ];
dx0 = x.strides[ 0 ];
// Set a pointer to the first indexed element:
ix = x.offset;
// Cache a reference to the input ndarray buffer:
xbuf = x.data;
// Initialize a counter:
count = 0;
// Iterate over the ndarray dimensions...
for ( i0 = 0; i0 < S0; i0++ ) {
if ( predicate.call( thisArg, xbuf[ ix ], [ i0 ], x.ref ) ) {
count += 1;
}
ix += dx0;
}
return count;
}
// EXPORTS //
module.exports = countIf1d;
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