Execution Context. By the end of this post, you should have a clearer understanding about what the interpreter is trying to do, why some functions / variables can be used before they are declared and how their value is really determined.
You can read a lot of resources online that refer to
scope, and for the purpose of this article to make things easier to understand, let’s think of the term
execution context as the envionment / scope the current code is being evaluated in. Now, enough talking, let’s see an example that includes both
function / local context evaluated code.
Nothing special is going on here, we have 1
global context represented by the purple border and 3 different
function contexts represented by the green, blue and orange borders. There can only ever be 1
global context, which can be accessed from any other context in your program.
You can have any number of
function contexts, and each function call creates a new context, which creates a private scope where anything declared inside of the function can not be directly accessed from outside the current function scope. In the example above, a function can access a variable declared outside of its current context, but an outside context can not access the variables / functions declared inside. Why does this happen? How exactly is this code evaluated?
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