var let const - Variable Declarations in JavaScript

The original variable declaration in JavaScript was "var". This gave us local and global scope.
In ES6, we gained the ability to create block scoped variables as well as constants. "let" gives us a replacement for variable declaration which is block scoped. "const" lets us create constants, which are variables that cannot be reassigned with new values.

[@rotrose7531]

Thank you very much for these super crystal-clear explanations!

[@Colstonewall]

Excellent explanation Steve. Thanks!

[@aliasanov8790]

Thanks, as always great explanation of important things!

[@chesterxp508]

Brilliant tutorials !!!

[@naysolutions4225]

Great content #letDeclarations

[@peternydahl6150]

Great video!

[@jeff-creations]

Another great video! Unrelated question: How do you get the black box shadow on the ( 55%?) linear gradient for your youtube thumbnail?

[@SteveGriffith-Prof3ssorSt3v3]

Photoshop drop shadow on the layer.

[@jeff-creations]

@@SteveGriffith-Prof3ssorSt3v3 Ahha! I was looking all over the place trying to figure out how you did that with CSS. Taking a little break from JS and learning more CSS this week. Thanks for the quick response. Hope your weekend rocks!

[@SteveGriffith-Prof3ssorSt3v3]

@@jeff-creations You can do it in CSS with this - kzbin.info/www/bejne/iXfVgayri7iXp7M Also have a look at - kzbin.info/www/bejne/gYOcaWWMrpJpa9E

[@jeff-creations]

@@SteveGriffith-Prof3ssorSt3v3 Sorry for the delay. Somehow I missed your response. I will absolutely check out those videos. I just bookmarked both of them. Thanks again!

[@EDC.EveryDayCode]

Var values can bleed out from one local scope into the block containing said scope. and jump scopes. So Let and Const are stricter.

[@SteveGriffith-Prof3ssorSt3v3]

Let and const are stricter. Yes. Var doesn't bleed out it just has local scope instead of block scope.

[@kapkaal]

excellent series..going through them one by one..!! hope u et maore subscribers the numbers aint doing justice to ur knowledge!!

[@SteveGriffith-Prof3ssorSt3v3]

Thanks. Please share the videos you like to help other people too.

[@johnywhy4679]

3:43 How is a block-level global variable (let) different from a non-block-level global variable (var)?

[@SteveGriffith-Prof3ssorSt3v3]

A global variable declared with any - const, let, or var - will have the same scope. Declared with `var` will also create a property on the window object of the same name. let abc = 'global'; var def = 'global'; window.abc // undefined window.def // 'global'

[@johnywhy4679]

@@SteveGriffith-Prof3ssorSt3v3 "A global variable declared with any - const, let, or var - will have the same scope." Sorry, same as what? thx

[@EDC.EveryDayCode]

@@johnywhy4679 I think he meant they will all have a global scope. (except in the case of the window object, which represents an open window in a browser. and is something additional to take into consideration.)

[@jasbindarsingh1640]

hey Steve, does let variables are not hoisted. // console.log(a); let a; Gives a reference error // a = 5; console.log(a); let a; This gives a reference error too //

[@SteveGriffith-Prof3ssorSt3v3]

kzbin.info/www/bejne/mXncqpeLo9iUjas - I've answered that in this video.

[@Rajeshwari141]

Love your Lord of the Rings references

[@MrMarkgyuro]

so is this a c++ tutorial ? : D

[@yarik83men51]

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