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RomansBermans / isValidNHSNumber.js
Last active Jun 2, 2016
NHS Number Validator in JavaScript
View isValidNHSNumber.js
function isValidNHSNumber(number) {
number = (number + '').replace(/\D/g, '');
if(number.length == 10) {
let total = 0;
// STEP 1: Starting from the left, multiply each of the first nine digits by (11 - digit position).
for(let i = 1; i <= 9; i++) {
* Fancy ID generator that creates 20-character string identifiers with the following properties:
* 1. They're based on timestamp so that they sort *after* any existing ids.
* 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs.
* 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly).
* 4. They're monotonically increasing. Even if you generate more than one in the same timestamp, the
* latter ones will sort after the former ones. We do this by using the previous random bits
* but "incrementing" them by 1 (only in the case of a timestamp collision).
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