Question 398637 in Javascript Question posted in
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Javascript – How to simplify this ternary expression?

I wonder if there is a simpler way to write this, or is it already in it’s most basic form?

A ? (B && C) : B
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2

Answers


  1. 0

    Assuming all are booleans, it says that to return true, either A and B and C must be true, or A must be false and B must be true. This can be written as A && B && C || !A && B.

    From this we can see that the result can only be true if B is true, so we can extract B from both parts: B && (A && C || !A) or the equivalent B && (!A || A && C).

    This can be further reduced to B && (!A || C). We now have one less term: A, B and C each occur once, so it could be considered simpler. Although because of the negation, not everyone might find it simpler to understand.

    Truth tables (created using https://truth-table.com):

    Truth tables

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  2. 0

    since ‘B’ will execute in either case, why not do it this way:

    B          //Execute B.
A && C     //If A is true, execute C else do nothing.
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