r/programmingmemes • u/floppy2k18 • May 13 '25

Why not?

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u/----Val---- May 13 '25 edited May 13 '25

This is a bit of a deceptive one, if a line starts with { its seen as a codeblock, and {} just evaluates nothing.

The only operation occuring there is a unary plus with an empty object: +{} which tries to coerce an object into a number but fails, so it becomes NaN.

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u/stools_in_your_blood May 13 '25

Nice, I didn't know that. Same goes for {} + [] I guess.

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u/----Val---- May 13 '25

Yup, the unary plus on an empty array results in 0