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crpl:docs:eq [2013/12/03 17:47] – Added code examples Grauniadcrpl:docs:eq [2025/02/14 14:57] (current) – external edit 127.0.0.1
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-~~DISCUSSION~~+
 <- [[crpl:crplreference| CRPL reference]] <- [[crpl:crplreference#comparators|Comparators]] <- [[crpl:crplreference| CRPL reference]] <- [[crpl:crplreference#comparators|Comparators]]
 =====  eq  ===== =====  eq  =====
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 === Comparing unlike types === === Comparing unlike types ===
 When trying to do a comparison where one argument is a string and the other is an int, the string gets coerced into an int.  If the string is something like "42" that coerces into 42.  If it is "abc" that coerces into 0. When trying to do a comparison where one argument is a string and the other is an int, the string gets coerced into an int.  If the string is something like "42" that coerces into 42.  If it is "abc" that coerces into 0.
 +
 +In particular, if x may be a string or number, (<-x "abc" eq) will unexpectedly return true when x equals 0. One remedy is to coerce x to a string before comparing as in (<-x "" concat "abc" eq).
  
 The 'eq' (and other comparators) look at both arguments and their intrinsic types.  The rules are: The 'eq' (and other comparators) look at both arguments and their intrinsic types.  The rules are:
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 Trace(<-OneAsString eq(<-one)) # returns 1/TRUE Trace(<-OneAsString eq(<-one)) # returns 1/TRUE
 Trace(<-OneAsString eq(<-zero)) # returns 0/FALSE Trace(<-OneAsString eq(<-zero)) # returns 0/FALSE
 +</code>
 +
 +<code>
 +# If core doesn't have Script.crpl attached, GetScriptVar will return 0.
 +# Then "MyScript" is coerced to 0 and the result is TRUE.
 +Trace(GetScriptVar(<-core "Script.crpl" "name") "MyScript" eq)
 +# The following version returns TRUE only if core has Script.crpl attached with
 +# a variable "name" whose value is the string "MyScript".
 +Trace(GetScriptVar(<-core "Script.crpl" "name") "" concat "MyScript" eq)
 </code> </code>
  
crpl/docs/eq.1386092869.txt.gz · Last modified: 2025/02/14 14:56 (external edit)

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