Experimental`

ValueFunction

represents a function to be applied whenever the symbol symb gets a new value.

更多信息和选项

To use ValueFunction, you first need to load the Experimental Functions Package using Needs["Experimental`"].
The assignment ValueFunction[symb]=f specifies that whenever symb gets a new value val, the expression f[symb,val] should be evaluated.
If the value of symb is cleared, f[symb] is evaluated.
ValueFunction takes account of all ways that the value of a symbol can be changed, not just Set.

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