I understand that the expression:
return A ? B : C
translates to
If A is true, return B; otherwise, return C
But how should I interpret the following:
return A ? B ? C : D : E
This code is not mine; I simply want to comprehend it.
I came across this answer/solution, which mentions that "Javascript is right-associative, so you 'resolve' the ternaries from right to left," but I still seek further clarification.
Just to clarify, the syntax A ? B : C represents a ternary operator. Instead of using A, B, and C, it can be rephrased as:
BOOLEAN ? EXPRESSION 1 : EXPRESSION 2
Depending on whether BOOLEAN evaluates to TRUE or FALSE, either EXPRESSION 1 or EXPRESSION 2 will be returned.
The expression A ? B ? C : D : E is known as a Nested Ternary. This can be broken down as follows:
BOOLEAN 1 ? (BOOLEAN 2 ? EXPRESSION 1 : EXPRESSION 2) : EXPRESSION 3
The EXPRESSION 1 mentioned earlier becomes (BOOLEAN 2 ? EXPRESSION 1 : EXPRESSION 2) in this nested scenario.
Therefore, the logic can be interpreted as follows:
If BOOLEAN 1 is TRUE, we evaluate the nested ternary operator. This involves a secondary assessment (BOOLEAN 2 TRUE? choose EXPRESSION 1, otherwise choose EXPRESSION 2). In contrast, if BOOLEAN 1 is FALSE, we simply return EXPRESSION 3.
A ? B ? C : D : E can be simplified to A ? (B ? C : D) : E.
When interpreting this expression as A ? X : E, note that X represents B ? C : D.
To understand how to interpret this, the conditions are evaluated sequentially, with the corresponding values for when the condition is false arranged in an outward-in nested rainbow pattern. The center value corresponds to when all conditions are true. Perhaps a visual diagram can clarify:
A ? B ? C ? D ? ALL_TRUE : D_IS_FALSE : C_IS_FALSE : B_IS_FALSE : A_IS_FALSE
│ │ │ │ X │ │ │ │
│ │ │ └──────────────┘ │ │ │
│ │ └───────────────────────────────┘ │ │
│ └────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
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