murex Shell Docs

Command Reference: [ (index)

Outputs an element from an array, map or table

Description

Outputs an element or multiple elements from an array, map or table.

Please note that indexes in murex are counted from zero.

Usage

<stdin> -> [ element ] -> <stdout>
$variable[ element ] -> <stdout>

<stdin> -> ![ element ] -> <stdout>

Examples

Return the 2nd (1), 4th (3) and 6th (5) element in an array

» ja [0..9] -> [ 1 3 5 ]
[
    "1",
    "3",
    "5"
]

Return the data-type and description of config shell syntax-highlighting

» config -> [[ /shell/syntax-highlighting ]] -> [ Data-Type Description ]
[
    "bool",
    "Syntax highlighting of murex code when in the interactive shell"
]

Return all elements except for 1 (2nd), 3 (4th) and 5 (6th)

» a: [0..9]-> ![ 1 3 5 ]
0
2
4
6
7
8
9

Return all elements except for the data-type and description

» config -> [[ /shell/syntax-highlighting ]] -> ![ Data-Type Description ]
{
    "Default": true,
    "Dynamic": false,
    "Global": true,
    "Value": true
}

Detail

Index counts from zero

Indexes in murex behave like any other computer array in that all arrays start from zero (0).

Include vs exclude

As demonstrated in the examples above, [ specifies elements to include where as ![ specifies elements to exclude.

Don't error upon missing elements

By default, index generates an error if an element doesn't exist. However you can disable this behavior in config

» config -> [ foobar ]
Error in `[` ((builtin) 2,11): Key 'foobar' not found

» config set index silent true

» config -> [ foobar ]

Synonyms

See Also

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Last built on Thu May 26 22:49:43 UTC 2022 against commit 59e27bb59e27bb1013043fc4a940cf9a2767c63f31dad2c.

Current version is 2.8.2100 which has been verified against 15889 tests cases.