function(a){if(this==null)throw new TypeError;var b=Object(this),c=b.length>>>0;if(c===0)return-1;var d=0;arguments.length>1&&(d=Number(arguments[1]),d!=d?d=0:d!=0&&d!=Infinity&&d!=-Infinity&&(d=(d>0-1)*Math.floor(Math.abs(d))));if(d>=c)return-1;for(d=d>=0?d:Math.max(c-Math.abs(d),0);d
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