JavaScript ES6 Tutorial #3 - The Let Keyword

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Yo ninjas, in this Ecmascript 6 tutorial, I'll be introducing you to the 'let' keyword. The let keword allows us to create a variable with lexical scope, which essentially means that the variable does not ignore code blocks. When we create a variable using the let keyqord within a code block, the variable is said to have lexical scope, and only applies WITHIN that code block.

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content from 8 years ago, and this is still very easy to comprehend and useful! Thank you!

xyzrdry

Nice tutorials, And that ninja screams so loud.

alejov

Wasn't it supposed to log 'undefined' because the variable no longer exists after the for loop is over?

leocroft

I still dont understand how numbers are saved to th functions in the loop anyway please help!

HAIM

Hey, I didn't understood why the value persisted?
We didn't created any closer here, still the value of x when defined using `let` acts like we did clouser. How that works?

SanujBhatnagar

In lexical scope, how is x value, when logged to console, not overwritten each iteration loop?

mykevin

@The Net Ninja hi, i still dont understand how is it that when you use var to declare, the output when you click a list item is 4. I don't understand the process that leads to that output.

iquahs

Thank you for your work, but I still don't understand the difference between the var keyword and the let keyword In the loop. Why is it going such way?

prometheusmusic

What would happen to the number result in console if you clicked the numbers in the order of 3 2 1 0 instead of going up 0123?

philliprousu

How did you making your Brackets linter to stop showing linting warnings about Es6?

Noldy__

Excellent tutorial, but has no sense have at 04:37 "x" how global scope. It should be a local variable for the "for" block. Seems "let" is the workaround to resolve this explicitly

manueljordan

I don't suppose you can do a framework tutorial and how to upload to a server?

anatolenavarro

So how did js deal with this before the let keyword was introduced?

lardosian

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