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use strstr for a faster find implementation (#17672)

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* use strstr for a faster find implementation
* stress the -d:release and -d:danger switches
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Andreas Rumpf 2021-04-08 00:54:47 +02:00 • committed by GitHub
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@ -67,6 +67,11 @@ aiming for your debugging pleasure. With `-d:release` some checks are
`turned off and optimizations are turned on
<nimc.html#compiler-usage-compileminustime-symbols>`_.
For benchmarking or production code, use the `-d:release` switch.
For comparing the performance with unsafe languages like C, use the `-d:danger` switch
in order to get meaningful, comparable results. Otherwise Nim might be handicapped
by checks that are **not even available** for C.
Though it should be pretty obvious what the program does, I will explain the
syntax: statements which are not indented are executed when the program
starts. Indentation is Nim's way of grouping statements. Indentation is
@ -626,7 +631,7 @@ Some terminology: in the example `question` is called a (formal) *parameter*,
Result variable
---------------
A procedure that returns a value has an implicit `result` variable declared
that represents the return value. A `return` statement with no expression is
that represents the return value. A `return` statement with no expression is
shorthand for `return result`. The `result` value is always returned
automatically at the end of a procedure if there is no `return` statement at
the exit.