javascript - What does the plus sign do in '+new Date' -

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i've seen in few places

function fn() {     return +new date; }

and can see returning timestamp rather date object, can't find documentation on plus sign doing.

can explain?

that's + unary operator, it's equivalent to:

function(){ return number(new date); }

see: http://xkr.us/articles/javascript/unary-add/

and in mdn: https://developer.mozilla.org/en-us/docs/web/javascript/reference/operators/arithmetic_operators#unary_plus


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