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If conditions $ vs ?
Sometimes i wonder how the $ differs with ? since most of the times both of them returning the same results. Not sure when to use $ and ?. Help me to understand this guys!
q)$[1b;`true;`false]
`true
q)?[1b;`true;`false]
`true
q)t:([]name:enlist `hi)
q)t
name
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hi
q)$[(count t)>0;`values;`novalues]
`values
q)?[(count t)>0;`values;`novalues]
`values -
2 Replies
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? can be used in vector-based condition . For example:
?[101b;`a;`b]
`a`b`a$ is used in single condition :
$[1b;`a;`b]
`a
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Apart from vector-based condition mentioned above, ? Will always run the fail condition unlike $.
$[1;2;err]
2 ?[1;2;err]
'err [0] ?[1;2;err]
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