murex Shell Docs

User Guide: Variable and Config Scoping

How scoping works within murex

A 'scope' in murex is a collection of code blocks to which variables and config are persistent within. In murex, a variable declared inside an if or foreach block will be persistent outside of their blocks as long as you're still inside the same function.

For example lets start with the following function that sets a variable called foo

function example {
    if { true } then { set foo=bar }
    out $foo
}

In here the value is getting set inside an if block but its value is is retrieved outside of that block. out and set have different parents but the same scoping.

Then lets set foo outside of that function and see what happens:

» set foo=oof
» $foo
oof

» example
bar

» $foo
oof

Despite setting a variable named foo, the value inside example does not overwrite the value outside example because they occupy different scoping.

What Instantiates A New Scope?

A new scope is instantiated by anything which resembles a function. This would be code inside events, dynamic autocompletes, open agents, any code blocks defined in config, as well as public and private functions too.

Code inside an if, switch, foreach and source do not create a new scope. Subshells also do not create a new scoping either.

See Also

This site's content is rebuilt automatically from murex's source code after each merge to the master branch. Downloadable murex binaries are also built with the website.

Last built on Tue Jun 22 08:18:17 UTC 2021 against commit 2235c7b2235c7b18f86f1cf214e246b88b0ea193d87fe80.

Current version is 2.2.1100 BETA which has been verified against tests.