Update ch2.md

[pranithsrujanroy]

the variable name is a block scoped variable but it's confusing when said it behaves as a variable declared with var

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I already searched for this issue

Edition: 2nd

Book Title: You Don't Know JS Yet

Chapter: 2

Section Title:

Topic:

[getify]

Why are you changing this?

[pranithsrujanroy]

It says - Both hello and name act generally as if they were declared with var. but name being a function parameter is block scoped and behaves like a variable declared with let.

In the later example of catch block isn't it the similar case where err is a parameter where it is written is block scoped and behaves as if declared with let

[getify]

but name being a function parameter is block scoped and behaves like a variable declared with let.

This is not accurate. Parameters are available to the entire function, and thus act more like a var. Moreover, you can do var paramName = .. in the function body to "re-declare" a variable, unlike let which would disallow such a re-declaration.

The way in which parameters do act more like a let declaration is if you're using = .. default parameter expressions, in which case you can violate the TDZ (which vars do not have). So parameters are sorta like both, but I would claim they are much more like var, especially historically, than like let.

[pranithsrujanroy]

This is not accurate. Parameters are available to the entire function, and thus act more like a var. Moreover, you can do var paramName = .. in the function body to "re-declare" a variable, unlike let which would disallow such a re-declaration.

then isn't is the same with err in catch block. I see the same scenario over there but there it is written it behaves more like a variable declared withlet