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luhn-generator

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A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

44 lines (37 loc) 1.36 kB
'use strict'; var GetIntrinsic = require('../GetIntrinsic'); var callBound = require('../helpers/callBound'); var $TypeError = GetIntrinsic('%TypeError%'); var $indexOf = callBound('Array.prototype.indexOf', true) || callBound('String.prototype.indexOf'); var $push = callBound('Array.prototype.push'); var Get = require('./Get'); var IsArray = require('./IsArray'); var ToLength = require('./ToLength'); var ToString = require('./ToString'); var Type = require('./Type'); // https://ecma-international.org/ecma-262/6.0/#sec-createlistfromarraylike module.exports = function CreateListFromArrayLike(obj) { var elementTypes = arguments.length > 1 ? arguments[1] : ['Undefined', 'Null', 'Boolean', 'String', 'Symbol', 'Number', 'Object']; if (Type(obj) !== 'Object') { throw new $TypeError('Assertion failed: `obj` must be an Object'); } if (!IsArray(elementTypes)) { throw new $TypeError('Assertion failed: `elementTypes`, if provided, must be an array'); } var len = ToLength(Get(obj, 'length')); var list = []; var index = 0; while (index < len) { var indexName = ToString(index); var next = Get(obj, indexName); var nextType = Type(next); if ($indexOf(elementTypes, nextType) < 0) { throw new $TypeError('item type ' + nextType + ' is not a valid elementType'); } $push(list, next); index += 1; } return list; };