Const vs Var vs Let - JavaScript ES6

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Learn about the difference between const, var, and let in JavaScript ES6 (ECMAScript 6).

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Nicely short and focused explained. Thx for that. :)
But what I don't understand is, why don't use var in general? It seems to have more advantages than let.

hansuswurstus
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The const keyword is pretty cool. I wonder about the people that needed "let", though :-)

(how LONG are your functions that you need this???)

As ranted elsewhere, even the bad/redundant JS features are things people need to know, so they can read the other guy's code.

Seriously, though, if I have decomposing assignment, I'm more likely to put a block in an IIFE which returns one or more longer term values, than to use a block with "let". Also, tend to use .forEach or Ramda map/filter operations more than for(;;) loops lately, so the block scope is kind of moot.

Roboprogs