JavaScript: Generate a UUID in Node.JS.
JavaScript fundamental (ES6 Syntax): Exercise-254 with Solution
Write a JavaScript program to generate a UUID in Node.JS. Use crypto API to generate a UUID, compliant with RFC4122 version 4.
- Use crypto.randomBytes() to generate a UUID, compliant with RFC4122 version 4.
- Use Number.prototype.toString(16) to convert it to a proper UUID.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const crypto = require('crypto');
const UUIDGeneratorNode = () =>
([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
(c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)
);
console.log(UUIDGeneratorNode());
Flowchart:

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JavaScript: Tips of the Day
How to check whether a string contains a substring in JavaScript?
ECMAScript 6 introduced String.prototype.includes:
const string = "foo"; const substring = "oo"; console.log(string.includes(substring));
includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:
var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1);
Ref: https://bit.ly/3fFFgZv
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