main.js (1899B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isCollection = require( '@stdlib/assert/is-collection' ); 24 var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive; 25 26 27 // MAIN // 28 29 /** 30 * Tests whether a collection contains at least `n` elements which are truthy. 31 * 32 * @param {Collection} collection - input collection 33 * @param {PositiveInteger} n - number of elements 34 * @throws {TypeError} first argument must be a collection 35 * @throws {TypeError} second argument must be a positive integer 36 * @returns {boolean} boolean indicating whether a collection contains at least `n` elements which are truthy 37 * 38 * @example 39 * var arr = [ 0, 0, 1, 2, 3 ]; 40 * 41 * var bool = some( arr, 3 ); 42 * // returns true 43 */ 44 function some( collection, n ) { 45 var count; 46 var len; 47 var i; 48 if ( !isCollection( collection ) ) { 49 throw new TypeError( 'invalid argument. First argument must be a collection. Value: `'+collection+'`.' ); 50 } 51 if ( !isPositiveInteger( n ) ) { 52 throw new TypeError( 'invalid argument. Second argument must be a positive integer. Value: `'+n+'`.' ); 53 } 54 len = collection.length; 55 count = 0; 56 for ( i = 0; i < len; i++ ) { 57 if ( collection[ i ] ) { 58 count += 1; 59 if ( count === n ) { 60 return true; 61 } 62 } 63 } 64 return false; 65 } 66 67 68 // EXPORTS // 69 70 module.exports = some;