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Format

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Format[expr]

holds values specifying how expr should be printed.

Assign values to Format to control how particular expressions
should be formatted when printed to the user.

• • Format[f[x___]] := Infix[{x}, "~"]

• • f[1, 2, 3]

• • f[1]

Raw objects cannot be formatted:

• • Format[3] = "three";

Format types must be symbols:

• • Format[r, a + b] = "r";

Formats must be attached to the head of an expression:

• • f /: Format[g[f]] = "my f";