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+--- Thread: lua table (/showthread.php?tid=4180)
lua table - benanderson_475 - 08.08.2022
i have table for some lua code for porting to mqtt like the below
knx_cfg = {
['3'] = {tag = 'Lounge Main', dim_ = true, knx_sw = '1/2/1', knx_sw_fb = '1/3/1', knx_dim = '1/4/1', knx_dim_fb = '1/5/1'},
['5'] = {tag = 'Lounge Seating', dim_ = true, knx_sw = '1/2/2', knx_sw_fb = '1/3/2', knx_dim = '1/4/2', knx_dim_fb = '1/5/2'},
}
if i check if for key that exists in table eg ['3'] or ['5'] all is well
if knx_cfg['3'].dim_ then
log( knx_cfg[3].dim_)
end
if i l check for a key that doesn't exist i get an error "attempt to index a nil value" which is expected as it doesn't exist
all i want to know is if the check for the key element [] i am looking for which is dynamic by other code exists in the table before next process, i was trying to not have a loop through
the table
is there another way?
Many Thanks,
RE: lua table - admin - 08.08.2022
You can check like this:
Code:
if knx_cfg['3'] and knx_cfg['3'].dim_ then
log( knx_cfg[3].dim_)
endOr a more strict check:
Code:
if type(knx_cfg['3']) == 'table' and knx_cfg['3'].dim_ then
log( knx_cfg[3].dim_)
endRE: lua table - benanderson_475 - 08.08.2022
Many Thanks