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Overview
Comment: | Updated lpop to not support index list. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
9cc9a92eab40a3f53387eb34cb41db9c |
User & Date: | pspjuth 2018-10-24 22:31:16.324 |
Context
2018-10-26
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21:07 | Started on discussion in 523 check-in: 9a80a7b5f2 user: pspjuth tags: trunk | |
2018-10-24
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22:31 | Updated lpop to not support index list. check-in: 9cc9a92eab user: pspjuth tags: trunk | |
19:36 | Note the branch for TIP 520 check-in: f441fd78d3 user: dkf tags: trunk | |
Changes
Changes to tip/523.md.
︙ | ︙ | |||
35 36 37 38 39 40 41 | set stack [lrange [K $stack [set stack {}]] 0 end-1] To support both queue and stack the pop end needs to be chosen, and the easiest way is to have an index argument. This trivially extends the functionality to remove any element. | | > > | > < | 35 36 37 38 39 40 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 | set stack [lrange [K $stack [set stack {}]] 0 end-1] To support both queue and stack the pop end needs to be chosen, and the easiest way is to have an index argument. This trivially extends the functionality to remove any element. Further, making it use multiple indices in the same way as lindex and lset does gives more symmetry and together with lset's ability to add to a sublist, doing push/pop on a sublist becomes feasible. The ability in lset and lindex to get an index list is not supported since argument expansion covers that usage. Since deleting last is rather common (stack) and also the cheapest operation, that is selected as default when no index is given. # Specification A new command is added to the core with the following format. lpop listVar ?index ...? The given indices are resolved to an element in the same way as lindex/lset does, except an index list is not supported, just plain index arguments. The return value is the element at index, and the list is modified to remove that element. If no index is given, the default is "end". An out of range index is an error. # Copyright This document has been placed in the public domain. |