Question

I’m reading some code and I see a comparison that’s laid out like this:

a = b = c

Seeing as how searching Javascript about equal or comparison yields remedial results, anyone care to explain what’s going on?

EDIT: These are all objects or object properties that we’re talking about here, should have specified.

DOUBLE EDIT: This is inside of an Object.defineProperties() block.

Answer 1

The = operator associates right-to-left and evaluates to the value that was assigned.

So this:

a = b = c;

Means this*:

b = c;
a = c;

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_{^* Unless you’re dealing with properties.}