JavaScript Form Validation Tutorial

Web Reference: Related to Is there a "null coalescing" operator in JavaScript? - JavaScript now has a ?? operator which I see in use more frequently. Previously most JavaScript code used ||. let userAge = Novice JavaScript developers need to know that the "not not" operator is using implicitly the original loose comparison method instead of the exact or operators and also the hidden cast operation that is happening behind the scenes and I show it in the example I provide. That is, JavaScript "short-circuits" the evaluation of Boolean operators and will return the value associated with either the first non-false variable value or whatever the last variable contains. See Anurag's explanation of those values that will evaluate to false. Using this technique is not good practice for several reasons; however.

YouTube Excerpt: Form validation is the process of ensuring that the data a user submits through a form is in the correct format and within the constraints set by the application. If the user enters data that is incorrect or missing, the form validation logic can prevent the form submission and prompt the user to correct the information. Form validation done via JavaScript on a web page is called 'client-side' form validation. 📚Materials/References: GitHub Code: https://github.com/pkellz/js-form-validation-project 🌎 Find Me Here: Twitter: https://twitter.com/realDevSage Discord: https://discord.gg/BP8wPv6raA Ebooks: https://payhip.com/devsage Merch: https://cottonbureau.com/people/devsage ⏰ Timestamps 0:24 - Demo 1:22 - Styling/CSS 14:26 - Adding Validation

Form validation is the process of ensuring that the data a user submits through a form is in the correct format and within the constraints set by...

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