In asmjs you see this sort of syntax &#x27;num | 0&#x27; a lot [0] to enforce that the number is an int, so that may be where he got the idea.<p>[0] <a href="http:&#x2F;&#x2F;www.sitepoint.com&#x2F;understanding-asm-js&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.sitepoint.com&#x2F;understanding-asm-js&#x2F;</a>