JavaScript Is There Any Time In JavasScript When “!value ? null : value[0]” Would Not Be Equivalent To “value ? value[0] : null”?

Adding formalism from the language specification to Pointy's answer here.

When you run your code through the conditional (? :) operator the first thing that happens is that ToBoolean is called on the left hand side.

When you do !value ToBoolean is called on the left hand side, and then ToBoolean on that. The spec is clear on this saying:

If ToBoolean(GetValue(lref)) is true, then

Let trueRef be the result of evaluating the first AssignmentExpression.

Else

Let falseRef be the result of evaluating the second AssignmentExpression.

So, assuming the JavaScript engine does not contain bugs there are no cases where you'd get a different result in JavaScript.

Answer:1

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