JavaScript : What do square brackets around an expression mean, e.g. `var x = a + [b]`?

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JavaScript : What do square brackets around an expression mean, e.g. `var x = a + [b]`?
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JavaScript : What do square brackets around an expression mean, e.g. `var x = a + [b]`?
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`var a JavaScript around square What brackets : [b]`? do expression an mean, + x e.g. =



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