luhn-generator
Version:
A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm
86 lines (80 loc) • 3.31 kB
JavaScript
;
var global = require('./_global');
var $export = require('./_export');
var redefine = require('./_redefine');
var redefineAll = require('./_redefine-all');
var meta = require('./_meta');
var forOf = require('./_for-of');
var anInstance = require('./_an-instance');
var isObject = require('./_is-object');
var fails = require('./_fails');
var $iterDetect = require('./_iter-detect');
var setToStringTag = require('./_set-to-string-tag');
var inheritIfRequired = require('./_inherit-if-required');
module.exports = function (NAME, wrapper, methods, common, IS_MAP, IS_WEAK) {
var Base = global[NAME];
var C = Base;
var ADDER = IS_MAP ? 'set' : 'add';
var proto = C && C.prototype;
var O = {};
var fixMethod = function (KEY) {
var fn = proto[KEY];
redefine(proto, KEY,
KEY == 'delete' ? function (a) {
return IS_WEAK && !isObject(a) ? false : fn.call(this, a === 0 ? 0 : a);
} : KEY == 'has' ? function has(a) {
return IS_WEAK && !isObject(a) ? false : fn.call(this, a === 0 ? 0 : a);
} : KEY == 'get' ? function get(a) {
return IS_WEAK && !isObject(a) ? undefined : fn.call(this, a === 0 ? 0 : a);
} : KEY == 'add' ? function add(a) { fn.call(this, a === 0 ? 0 : a); return this; }
: function set(a, b) { fn.call(this, a === 0 ? 0 : a, b); return this; }
);
};
if (typeof C != 'function' || !(IS_WEAK || proto.forEach && !fails(function () {
new C().entries().next();
}))) {
// create collection constructor
C = common.getConstructor(wrapper, NAME, IS_MAP, ADDER);
redefineAll(C.prototype, methods);
meta.NEED = true;
} else {
var instance = new C();
// early implementations not supports chaining
var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance;
// V8 ~ Chromium 40- weak-collections throws on primitives, but should return false
var THROWS_ON_PRIMITIVES = fails(function () { instance.has(1); });
// most early implementations doesn't supports iterables, most modern - not close it correctly
var ACCEPT_ITERABLES = $iterDetect(function (iter) { new C(iter); }); // eslint-disable-line no-new
// for early implementations -0 and +0 not the same
var BUGGY_ZERO = !IS_WEAK && fails(function () {
// V8 ~ Chromium 42- fails only with 5+ elements
var $instance = new C();
var index = 5;
while (index--) $instance[ADDER](index, index);
return !$instance.has(-0);
});
if (!ACCEPT_ITERABLES) {
C = wrapper(function (target, iterable) {
anInstance(target, C, NAME);
var that = inheritIfRequired(new Base(), target, C);
if (iterable != undefined) forOf(iterable, IS_MAP, that[ADDER], that);
return that;
});
C.prototype = proto;
proto.constructor = C;
}
if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) {
fixMethod('delete');
fixMethod('has');
IS_MAP && fixMethod('get');
}
if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER);
// weak collections should not contains .clear method
if (IS_WEAK && proto.clear) delete proto.clear;
}
setToStringTag(C, NAME);
O[NAME] = C;
$export($export.G + $export.W + $export.F * (C != Base), O);
if (!IS_WEAK) common.setStrong(C, NAME, IS_MAP);
return C;
};