71 lines
1.9 KiB
JavaScript
71 lines
1.9 KiB
JavaScript
/**
|
|
* @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;
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Tests whether a collection contains at least `n` elements which are truthy.
|
|
*
|
|
* @param {Collection} collection - input collection
|
|
* @param {PositiveInteger} n - number of elements
|
|
* @throws {TypeError} first argument must be a collection
|
|
* @throws {TypeError} second argument must be a positive integer
|
|
* @returns {boolean} boolean indicating whether a collection contains at least `n` elements which are truthy
|
|
*
|
|
* @example
|
|
* var arr = [ 0, 0, 1, 2, 3 ];
|
|
*
|
|
* var bool = some( arr, 3 );
|
|
* // returns true
|
|
*/
|
|
function some( collection, n ) {
|
|
var count;
|
|
var len;
|
|
var i;
|
|
if ( !isCollection( collection ) ) {
|
|
throw new TypeError( 'invalid argument. First argument must be a collection. Value: `'+collection+'`.' );
|
|
}
|
|
if ( !isPositiveInteger( n ) ) {
|
|
throw new TypeError( 'invalid argument. Second argument must be a positive integer. Value: `'+n+'`.' );
|
|
}
|
|
len = collection.length;
|
|
count = 0;
|
|
for ( i = 0; i < len; i++ ) {
|
|
if ( collection[ i ] ) {
|
|
count += 1;
|
|
if ( count === n ) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = some;
|