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* @license Apache-2.0
*
* Copyright (c) 2018 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 isCollection = require( '@stdlib/assert/is-collection' );
var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
var isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Tests whether a collection contains at least `n` elements which pass a test implemented by a predicate function, iterating from right to left.
*
* @param {Collection} collection - input collection
* @param {PositiveInteger} n - number of elements
* @param {Function} predicate - test function
* @param {*} [thisArg] - execution context
* @throws {TypeError} first argument must be a collection
* @throws {TypeError} second argument must be a positive integer
* @throws {TypeError} third argument must be a function
* @returns {boolean} boolean indicating whether a collection contains at least `n` elements which pass a test
*
* @example
* function isNegative( v ) {
* return ( v < 0 );
* }
*
* var arr = [ -1, 1, -2, 3, 4 ];
*
* var bool = someByRight( arr, 2, isNegative );
* // returns true
*/
function someByRight( collection, n, predicate, thisArg ) {
var count;
var out;
var len;
var i;
if ( !isCollection( collection ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a collection. Value: `%s`.', collection ) );
}
if ( !isPositiveInteger( n ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a positive integer. Value: `%s`.', n ) );
}
if ( !isFunction( predicate ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a function. Value: `%s`.', predicate ) );
}
len = collection.length;
count = 0;
for ( i = len-1; i >= 0; i-- ) {
out = predicate.call( thisArg, collection[ i ], i, collection );
if ( out ) {
count += 1;
if ( count === n ) {
return true;
}
}
// Account for dynamically resizing a collection...
if ( len !== collection.length ) {
i += ( collection.length - len );
len = collection.length;
}
}
return false;
}
// EXPORTS //
module.exports = someByRight;
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