abe061e408
* Tableize flag-parsing for on-line help, doc autogen, etc. * Rename cli,cliutil packages -> climain,cli * stub for new flag-list page * Fix alignment & formatting for webdoc/manpage autogen * per-flag-section info in mlr help * Fix comparison of actual vs expected stderr file in regtest * Replace old flag-parser with new
2.8 KiB
Operator precedence
Operators are listed in order of decreasing precedence, highest first.
Operators Associativity --------- ------------- () left to right ** right to left ! ~ unary+ unary- & right to left binary* / // % left to right binary+ binary- . left to right << >> >>> left to right & left to right ^ left to right | left to right < <= > >= left to right == != =~ !=~ left to right ??? ?? && left to right ^^ left to right || left to right ? : right to left = N/A for Miller (there is no $a=$b=$c)
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
minandmaxfunctions are different from other multi-argument functions which return null if any of their inputs are null: forminandmax, 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. -
Symmetrically with respect to the bitwise OR, XOR, and AND operators
|,&, and^, Miller has logical operators||,&&, and^^. -
The exponentiation operator
**is familiar from many languages, except that an integer raised to an int power is int, not float. -
The regex-match and regex-not-match operators
=~and!=~are similar to those in Ruby and Perl.