![]() Name.length returns the length of the passed argument, not whether it's true. New Boolean(true) returns an object wrapper, not the boolean value itself. !false (which is what !!name practically is) returns true.īy setting has Name equal to name, you set hasName equal to whatever value you passed to the getName function, not the boolean value true. If name is truthy, which we want to test for, !name returns false. With !!name, we determine whether the value of name is truthy or falsy. Use crypto API to generate a UUID, compliant with RFC4122 version 4. ![]() Next: Write a JavaScript program to generate a UUID in Node.JS. Previous: Write a JavaScript program to convert the values of RGB components to a color code. #UUID GENERATOR JAVASCRIPT CODE#Improve this sample solution and post your code through Disqus See the Pen javascript-basic-exercise-253-1 by w3resource ( on CodePen. ![]() then call your method, in your case, call uuid () and voila You can see the results Sample uuids generated by your code: 7fc76c58-54b3-4e03-a743-64905a56a0bb. In this section we will write a very simple code snippet to generate a v4 UUID. The code from the sections below was tested using Node.js, Visual Studio Code and the Code Runner extension. ( + -1e3 + -4e3 + -8e3 + -1e11).replace(//g, c => go to Tools -> Developer Menu (or use specific Windows/Unix shortcuts to get here) go to Console. Note that it is also common to use the term GUIDs (Globally Unique IDentifiers) to refer to UUIDs 2.
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