I saw something
digit = +digit; in jQuery Credit Card Validator @line 127
What is the purpose of this usage.
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engincancan
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1In case digit is a string, this will parse to number – juvian Nov 03 '14 at 18:40
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2The `+` just casts `digit` to a number. – j08691 Nov 03 '14 at 18:40
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3@juvian not an `int`, a number; JavaScript doesn't really have an integer type. – Pointy Nov 03 '14 at 18:41
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@Carpetsmoker not really. It works with floating point representations and even with parseFloat you would have many differences. – Denys Séguret Nov 03 '14 at 18:41
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3And as long as we're being pedantic, it's not a *cast*, it's a *conversion* (@j08691). – T.J. Crowder Nov 03 '14 at 18:42
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1`+digit` is JS hack to turn string into a digit, it's like `digit >> 0` to floor (round `Math.floor`) the number. – volter9 Nov 03 '14 at 18:51
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It is a little bit different from parseInt() because it converts string to a number as @t-j-crowder said already. It converts null to zero – engincancan Nov 03 '14 at 19:00