Menu
Suppose I have a variables in the global scope.
Suppose I wish to define a function which I can guarantee will not have access to this variable, is there a way to wrap the function, or call the function, that will ensure this?
In fact, I need any prescribed function to have well defined access to variables, and that access to be defined prior to, and separate from that function definition.
Motivation: I'm considering the possibility of user submitted functions. I should be able to trust that the function is some variety of "safe" and therefore be happy publishing them on my own site.
233
Scope in JavaScript refers to the current context of code, which determines the accessibility of variables to JavaScript. The two types of scope are local and global: Global variables are those declared outside of a block. Local variables are those declared inside of a block.
Block Level Scope: This scope restricts the variable that is declared inside a specific block, from access by the outside of the block. The let & const keyword facilitates the variables to be block scoped. In order to access the variables of that specific block, we need to create an object for it.
JavaScript has the following kinds of scopes: Global scope: The default scope for all code running in script mode. Module scope: The scope for code running in module mode.
The let declaration declares a block-scoped local variable, optionally initializing it to a value.
Run the code in an iframe hosted on a different Origin. This is the only way to guarantee that untrusted code is sandboxed and prevented from accessing globals or your page's DOM.
72
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
