Sha256: 381140b8ec558deeb800bb349b0086b4adce5f3c5a06ed078e950cc7f5f5fb7a
Contents?: true
Size: 643 Bytes
Versions: 73
Compression:
Stored size: 643 Bytes
Contents
'use strict';
function isValid(number) {
var numbers = number.replace(/\s/g, '');
const digits = [...numbers];
const sum = digits
// convert to integers
.map(d => parseInt(d, 10))
// double even positions (odd indexes)
.map((d, i) => {
if (i % 2 !== 0) {
return d * 2;
}
return d;
})
// limit to digits less than 10
.map(d => {
if (d > 9) {
return d - 9;
}
return d;
})
// sum all digits
.reduce((d, acc) => d + acc, 0);
return sum > 0 && sum % 10 === 0;
}
function Luhn(number) {
this.valid = isValid(number);
}
module.exports = Luhn;
Version data entries
73 entries across 73 versions & 1 rubygems