Scala trait linearization merges parent linearizations from right to left, deleting an earlier occurrence when that same ancestor occurs in a later appended parent linearization. Each class precedes its ancestors, and an ancestor appears once.[ref]
Scala 2.13 classes and objects specification. Class Linearization: concatenation replaces identical elements of its left operand with their occurrences in the right operand; the same rule is used for the Scala 2 code here
Ignoring the predefined roots gives| Type | Linearization, most specific first |
|---|---|
K | K |
I | I, K |
J | J, K |
G | G, I, K |
F | F, J, I, K |
H | H, J, K |
D | D, F, J, G, I, K |
E | E, H, J, K |
A | A, D, F, J, G, I, K |
B | B, E, H, D, F, J, G, I, K |
C | C, E, H, J, K |
Each override appends its letter after
super.m returns. Reading the method chain in reverse from K therefore yields the three output lines:KIGJFDA
KIGJFDHEB
KJHECIn particular, mixing
H into C again does not create another H or move it before its subclass E. Also, J lies between F and G in D's chain; super follows the final linearization, not simply one statically named parent. Articles by others on the same topic
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