JavaScript Tutorial For Beginners #11 - Booleans in JavaScript

Yo guys, today we're gonna look at boolean values (true and false values) and the different values that are seen as "truthy" or "falsey" by JavaScript. To determine whether a value is truthy or falsey, we can use the built in JavaScript Boolean() function.

Other expressions can also be evaluated as true or false, for example, is 7 greater than 5. Is X smaller than Y etc. We'll go on to use expressions like this when we start using if statements and loops.

As always, any questions - just comment below :).

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[PcpopravkeBlogspot]

I had headphones on max volume and that ninja intro made me jump out of my chair! :P :D

[seanearnest]

Came here from Colt Steele's Udemy web developer course for some in-depth followup on Booleans. Thank you for the clear and pragmatic explanations of this material! As a beginner programmer it is helpful to see actual applications of concepts sequentially instead of front-loading with too much theory. Perhaps some folks learn better that way, but I find I learn best through practical examples and having to figure my way out rather than just following along.

[justcoolstuff]

I also like how I could learn something real quick and as the video ends, I could go practice on that one thing I learn. With long video, I have to decide when I should stop and practice. With these, I don't have to.

[despiertacatolico]

Hey Net Ninja, love how you get through the topics with the short videos!!! Question, when you say we can determine whether a value is "truthy" or "falsey" is that another way for saying "true" or "false"? Or does it mean something else and i'm just completely missing it? Thanx! Ingrid

[joseflores-cxld]

For remind, 0 = falsy, "" (string empty) = falsy, NaN and undefined = falsy. "txt random" = true, -1 = true, [] = true {} = true. that is all

[TonySousa]

Very well explained as usual. Thank you. TT

[austincoletowns]

Amazing video! Whatever that was, I want more of it!

[shiran]

Hi Net Ninja, why the number 0 by it self is automatically false ? I'm referring to the example boolean(o); thank you for your answer

[JCMLR]

Just a word of advice, when referring to the double ==, identify it as IDENTICAL. For example, if "7 == 7", say: 7 is IDENTICAL to 7. Just to avoid confusion with the single '=' sign, which should be referred as 'equal'. Hope this helps!

[DanteHellDrive]

Boolean(number/0) returns true
interesting

[alexmason]

me watching python tutorial
the net ninja: let's create a menu
me jumping to javascript tutorial
the net ninja: meat menu.

[sciencegeeks]

please can you use the code editor when teaching some people cannot do what you do thnks

[FuzzYSrb]

I`m watching this video (and this tutorial for JavaScript) in 2020 and I wonder is this still valid or there are a lot of changes ? should I continue to watch or look for something updated? Thanks.

[EmperorHerpes]

var iLikeDick = false
iLikeDick
*true*


fml

[binsbega]

I have a proj for billing system that requires block and lot checklist. What prog language can i use for my front and back-end? Thanks for reply Net Ninja!

[generalimperial]

I typed the code in to try to see if the Boolean would work and it did not and I kept getting Xs on the left.

[rocknrolla]

din din don din din don din dun dun din tur rururu whaa