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modifying hash/dict elements [message #88647]

Fri, 23 May 2014 06:23

JDS
Messages: 94
Registered: March 2009

Member

I wonder why this doesn't work:

IDL> h=hash()
IDL> h['foo']++
% Type conversion error: Unable to convert given STRING to Long64.

nor:

IDL> h=dictionary()
IDL> h.foo++
% Data of this type cannot be used with increment or decrement operators:
POINTER.

nor do keys auto-instantiate when referenced:

IDL> h.foo+=1
% Key does not exist: "FOO"

and yet:

IDL> h.foo=1
IDL> h.foo+=1

work fine.

I think dicts/hashes should auto-subtantiate keys on any left-hand access, not just assignment, and that all elements of dicts/hashes should be available for any left-hand operation, including increment/decrement.

JD

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[Message index]

		modifying hash/dict elements By: JDS on Fri, 23 May 2014 06:23
		Re: modifying hash/dict elements By: chris_torrence@NOSPAM on Fri, 23 May 2014 09:02
		Re: modifying hash/dict elements By: JDS on Wed, 28 May 2014 16:48

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