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39 lines
1.6 KiB
Markdown
39 lines
1.6 KiB
Markdown
# DSL reference: operators
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## Operator precedence
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Operators are listed in order of decreasing precedence, highest first.
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GENMD_CARDIFY
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Operators Associativity
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--------- -------------
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() left to right
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** right to left
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! ~ unary+ unary- & right to left
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binary* / // % left to right
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binary+ binary- . left to right
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<< >> left to right
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& left to right
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^ left to right
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| left to right
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< <= > >= left to right
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== != =~ !=~ left to right
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&& left to right
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^^ left to right
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|| left to right
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? : right to left
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= N/A for Miller (there is no $a=$b=$c)
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GENMD_EOF
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## Operator and function semantics
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* Functions are often pass-throughs straight to the system-standard Go libraries.
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* The `min` and `max` functions are different from other multi-argument functions which return null if any of their inputs are null: for `min` and `max`, by contrast, if one argument is absent-null, the other is returned. Empty-null loses min or max against numeric or boolean; empty-null is less than any other string.
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* Symmetrically with respect to the bitwise OR, XOR, and AND operators `|`, `^`, `&`, Miller has logical operators `||`, `^^`, `&&`: the logical XOR not existing in Go.
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* The exponentiation operator `**` is familiar from many languages.
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* The regex-match and regex-not-match operators `=~` and `!=~` are similar to those in Ruby and Perl.
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