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

» example

» $foo

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

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Last built on Thu Oct 13 08:08:18 UTC 2022 against commit ed6b6fced6b6fc609f4be93c5d3348695a762facfecf48f.

Current version is 2.11.2200 which has been verified against 16798 tests cases.