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* @license Apache-2.0
*
* Copyright (c) 2024 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 isAccessorArray = require( '@stdlib/array/base/assert/is-accessor-array' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// FUNCTIONS //
/**
* Counts the number of elements in an indexed array which pass a test implemented by a predicate function.
*
* @private
* @param {Collection} x - input array
* @param {Function} predicate - predicate function
* @param {*} thisArg - predicate function evaluation context
* @returns {NonNegativeInteger} result
*
* @example
* function predicate( value ) {
* return ( value > 0 );
* }
*
* var x = [ 0, 1, 0, 1, 1 ];
*
* var n = indexed( x, predicate, {} );
* // returns 3
*/
function indexed( x, predicate, thisArg ) {
var n;
var i;
n = 0;
for ( i = 0; i < x.length; i++ ) {
if ( predicate.call( thisArg, x[ i ], i, x ) ) {
n += 1;
}
}
return n;
}
/**
* Counts the number of elements in an accessor array which pass a test implemented by a predicate function.
*
* @private
* @param {Collection} x - input array
* @param {Function} predicate - predicate function
* @param {*} thisArg - predicate function evaluation context
* @returns {NonNegativeInteger} result
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
*
* function predicate( value ) {
* return ( value > 0 );
* }
*
* var x = toAccessorArray( [ 0, 1, 0, 1, 1 ] );
*
* var n = accessors( x, predicate, {} );
* // returns 3
*/
function accessors( x, predicate, thisArg ) {
var get;
var n;
var i;
get = resolveGetter( x );
n = 0;
for ( i = 0; i < x.length; i++ ) {
if ( predicate.call( thisArg, get( x, i ), i, x ) ) {
n += 1;
}
}
return n;
}
// MAIN //
/**
* Counts the number of elements in an array which pass a test implemented by a predicate function.
*
* @param {Collection} x - input array
* @param {Function} predicate - predicate function
* @param {*} [thisArg] - predicate function evaluation context
* @returns {NonNegativeInteger} result
*
* @example
* function predicate( value ) {
* return ( value > 0 );
* }
*
* var x = [ 0, 1, 0, 1, 1 ];
*
* var n = countIf( x, predicate );
* // returns 3
*/
function countIf( x, predicate, thisArg ) {
if ( isAccessorArray( x ) ) {
return accessors( x, predicate, thisArg );
}
return indexed( x, predicate, thisArg );
}
// EXPORTS //
module.exports = countIf;
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