CODEWITHSUNDEEP
javascript
iamfazn
iamfazn

Reputation: 21

JavaScript Internals: Where are the variables stored in-between compilation and execution phase ?

Reference: You don't know JS (scopes & closures)

Chapter 2: Lexical Scope

Consider an example:

var a = 2;

JavaScript first compiles the above code. So first the compiler does the lexical breakdown. It breaks it down as:

var a; &
a = ?;

While breaking it down as var a it informs the scope about it. And the scope maintains information that a is present within that scope or not.

Then begins the execution stage. Where a = 2 is assigned. I am trying to understand where the value of "a" i.e a = "2" stored before the execution stage starts i.e is there any memory allocation happening.

Upvotes: 0

Views: 105

Answers (1)

Bergi
Bergi

Reputation: 665020

The compiler does not only do the lexical breakdown, it parses the whole code into an appropriate data structure (e.g. a parse tree) that also holds literals such as 2. It basically holds an instruction such as "In a scope with the variable a, assign the value derived from the constant expression 2 to the variable with the name a."

Upvotes: 0

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