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They’re no longer just pictures and videos shot in real-time. This shortcut is unambiguously defined, and therefore distinguishable from other available syntaxes.Seeing all the time, effort, emojis, drawings, and true works of art put into an Insta story, we know for sure stories are not what they once were. Similarly, we have for other symbols with a position-related argument: Extractįor all these symbols, as mentioned by Kuba in a comment below, a key specified as a string need not to be wrapped in Key. Using the wrapper Key allow to distinguish between the position in the association and the corresponding key, stripping one level of Key in the process: assoc = x, 1 -> y, Key -> z|> These symbols all have definitions prior to the introduction of associations, which probably explain why a particular syntax is needed to get an unambiguous additional definition.įor instance, prior to 10.0, Part accepts only integers or valid Span specifications. There are symbols that need the keys to be wrapped into Key in order to be correctly interpreted. Lookup could be seen as an exception to the rule, and its particular behavior is documented in the sections "Properties & Relations" and "Possible Issues". So it should satisfied the proposed rule, but this is not the case: Lookup Lookup looks up the value associated with key in the association assoc This wrong behavior is fixed as of 11.0.1 and solves the inconsistency with all other ?Key* symbols. In versions 10.4.1 and earlier, KeyDrop fails to make the distinction between the arguments key and Key. What is a possible motivation behind that change? Note that the last input used to give True in 10.2 and earlier, so the change made in 10.3 seems to support the proposed rule. Which shows that the keys key and Key are different. We have in all three versions: KeyExistsQ Leaving aside the symbols KeyDrop and Lookup which I address further down, this rule seems to apply on all ?Key* symbols and other Association-related functions, in the mentioned versions 10.4.1, 11.0.0 and 11.0.1.Īs examples about this rule and its constancy, consider KeyExistsQ and KeyMemberQ. When the syntax of a function explicitly asks for a key as an argument, wrapping this key key in the symbol Key defines a different key, the expression of which is Key. Other symbols prior to the introduction of associations, that act on expressions of any head and have a position-related argument, ask for the wrapper Key in order to be used in a special way on associations, except for keys specified as strings.Īre there any consistent rules about using Key? The wrapper Key is interpreted verbatim by all ?Key* and Association-related functions, the current exception being Lookup which strips one level of Key.
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