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Overview
Comment: | Fix some spelling and awkward wording |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
52d37fea350b97cf95a579e54315d955 |
User & Date: | dkf 2018-06-10 20:49:14.802 |
Context
2018-06-13
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20:50 | examples and docu of tip 507 added check-in: 8331611a7f user: rene tags: trunk | |
2018-06-10
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20:49 | Fix some spelling and awkward wording check-in: 52d37fea35 user: dkf tags: trunk | |
20:44 | Formatting tweaking check-in: 11ef41277a user: dkf tags: trunk | |
Changes
Changes to tip/508.md.
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15 16 17 18 19 20 21 | for arrays, causing that value to be returned any time an attempt is made to access an element of the array that isn't present. # Rationale For its most basic usages, a Tcl array variable can be seen as a collection of scalar variables. However, an array also has its own existence as a variable and | | | 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | for arrays, causing that value to be returned any time an attempt is made to access an element of the array that isn't present. # Rationale For its most basic usages, a Tcl array variable can be seen as a collection of scalar variables. However, an array also has its own existence as a variable and provides specific actions on itself and on its elements. For example, the regular way to check for a variable existence is to use the **info exists** command, and this is true for both arrays and scalars (including array elements); likewise, the **set** command is used to read and write the value of a scalar vars and array elements, however array variables have no value in themselves but provide a way to get and set several of its elements at once. For more advanced usages, one must get past the simple ‘collection of scalars’ |
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41 42 43 44 45 46 47 | A new **array default** subcommand will be created with the following syntax: > **array default** _option arrayName_ ?_arg_? The following _option_ values are supported: | | | | | | | | | | 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | A new **array default** subcommand will be created with the following syntax: > **array default** _option arrayName_ ?_arg_? The following _option_ values are supported: * **array default get** _arrayName_ — Get the default value for the array _arrayName_. Raise an error if _arrayName_ is not an array variable or if it has no default value. * **array default set** _arrayName value_ — Set the default value for the array _arrayName_. If the variable _arrayName_ does not already exist, it is created with an empty array value. Raise an error if _arrayName_ is an existing scalar variable or an invalid array name. * **array default exists** _arrayName_ — Tests whether the array _arrayName_ has a default value. Return false if _arrayName_ does not exist. Raises an error if a variable _arrayName_ exists but is not an array variable. * **array default unset** _arrayName_ — Unsets _arrayName_'s default value so that the array no longer has a default. Does nothing if _arrayName_ does not exist. Raises an error if _arrayName_ is not an array variable. The default value is only used as a last resort where an error would normally occur when accessing a non-existing array element. Read traces are processed _before_ that point and are free to set the element value or modify the default value. |
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