murex Shell Docs

Command Reference: break

terminate execution of a block within your processes scope

Description

break will terminate execution of a block (eg function, private, foreach, if, etc).

break requires a parameter and that parameter is the name of the caller block you wish to break out of. If it is a function or private, then it will be the name of that function or private. If it is an if or foreach loop, then it will be if or foreach (respectively).

Usage

break block-name

Examples

Exiting an iteration block:

function foo {
    %[1..10] -> foreach i {
        out $i
        if { $i == 5 } then {
            out "exit running function"
            break foo
            out "ended"
        }
    }
}

Running the above code would output:

» foo
1
2
3
4
5
exit running function

Exiting a function:

break can be considered to exhibit the behavior of return (from other languages) too

function example {
    if { $USER == "root" } then {
        err "Don't run this as root"
        break example
    }
    
    # ... do something ...
}

Detail

break cannot escape the bounds of its scope (typically the function it is running inside). For example, in the following code we are calling break bar (which is a different function) inside of the function foo:

function foo {
    %[1..10] -> foreach i {
        out $i
        if { $i == 5 } then {
            out "exit running function"
            break bar
            out "ended"
        }
    }
}

function bar {
    foo
}

Regardless of whether we run foo or bar, both of those functions will raise the following error:

Error in `break` (7,17): no block found named `bar` within the scope of `foo`

See Also

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Last built on Tue Jan 31 12:58:18 UTC 2023 against commit c6bc4d8c6bc4d8f96c958dcb16d78e66d89468aef288078.

Current version is which has been verified against 13941 tests cases.