Credit Card
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function isValid(ccnum){
var sum = 0;
ccnum = ccnum.split('');
for(var i=0; i < ccnum.length; i++){
if(ccnum[i] == ' '){
ccnum.splice(i,1);
}
}
for(var t = 0; t < ccnum.length; t=t+2){
ccnum[t] == ccnum[t]*2;
}
for(var w = 0; w < ccnum.length; w++){
sum = sum + Number(ccnum[w]);
}
if(sum % 10 === 0){
return true;
}else{
return false;
}
}
console.log(isValid("4408 0412 3456 7893") === false)
console.log(isValid("5000000000000000") === false)
JavaScript
INFO