3 ms·

Small detail, what's with the plus in this code from that site: last = +new Date();

• leeoniya 7y ago
  converts the date object to a unix timestamp* (int). a + works for coercing stuff to numbers. e.g. +"0.5" is quicker than paraseFloat("0.5") and also saves you from having to know if you need to use parseFloat or parseInt. coersion to strings can also be done by appending to an empty string: "" + 0.5. * in ms
• lewiscollard 7y ago
  It is a trick to coerce it to an integer. >> new Date() Date 2019-05-27T12:52:41.932Z >> +new Date() 1558961556913 >> +"4" // works on anything else :) 4
  • ape4 7y ago
    + can concatenate strings. So I guess there is an implied: 0 + in there to make it in integer mode.
    • dentemple 7y ago
      There's no implication involved. It's the unary operator, and it performs the type conversion exactly as specced.
      • ape4 7y ago
        TIL, https://scotch.io/tutorials/javascript-unary-operators-simple-and-useful#toc-unary-plus- https://scotch.io/tutorials/javascript-unary-operators-simpl...