//Information Source
// https://www.freeformatter.com/credit-card-number-generator-validator.html
function luhnValidate( target ){
if( target ){
target = "" + target;
var digits = target.split("");
var lastDigit = parseInt(digits.splice(digits.length-1)[0]);
var result = digits.reverse()
.map(function(item,index){
var result = parseInt(item);
if( (index + 1)%2 == 1 ){
result = result * 2;
}
if( result > 9 ){
result -= 9;
}
return result;
})
.reduce(function(accumulator,item){
return accumulator + item;
},0);
return modulo(result,10) === lastDigit;
} else {
return false;
}
}
function modulo( target, mod ){
if( target && mod ){
return (mod-(target%mod))%mod;
} else {
return target;
}
}
var VisaClassification = {
classification : 'VISA',
length : [13,16,19],
regex : /^4.+/
};
var MastercardClassification = {
classification : 'MASTER',
length : [16],
regex : /^5[1-5].+/
};
function classify( target, classification ){
if( target && classification ){
target = ""+target;
if( classification.length && classification.regex ){
var length = classification.length;
if( !Array.isArray(length) ){
length = [].push(length);
}
var lengthTest = length.
map(function(item){
return target.length === item;
}).
reduce(function(result,item){
return result || item;
},false);
var iinTest = classification.regex.test(target);
if( lengthTest && iinTest ){
return classification.classification;
} else {
return null;
}
}
}
}
var classifications = [
VisaClassification,
MastercardClassification
];
var targets = [
"4556737586899855",
"4111111111111111",
4444333322221111,
"5105105105105100",
"5504182320730498"
];
targets.forEach(function(target){
var classified = classifications.map(function(classification){
return classify(target, classification);
}).filter(function(item){return item});
console.log( target, " ", (luhnValidate(target))?"Valid":"Invalid", classified);
});
