What is correct method to determine if a map key exists?

[cssyphus]

What is the correct way to determine if a map element exists?

For example, the isDefined() test generates an "Array subscript out of bounds" error:

Code Select Expand

_Lst = `Ann,1` :@TAB: `Bob,2` :@TAB: `Carl,3`
_map = MapCreate(_Lst)
if isDefined(_map[`Bob`])
message(`Bob is in pos`, _map[`Bob`])
endif
if isDefined(_map[`Fred`])
message(`Fred is in pos`, _map[`Fred`])
endif



[td]

MapKeyExist

[cssyphus]

I'm going with: "that wasn't in MY copy of the help file when I looked at it yesterday..." But it's there now. Spooky. Mandela effect?

Thanks Tony.

Man, if I had an extra minute of life for every hour I've spent searching for something that is right under my nose (and often not finding it)... I'd live forever.

[td]

My wife calls it refrigerator blindness...

[kdmoyers]

I appear to be nearly blind to my own typos.  It's a bummer.

[snowsnowsnow]

My wife calls it refrigerator blindness...

I first heard that term in a comedy routine by Rita Rudner.

She's great.  I love her.