javascript large integer round because precision? (why?)

Question

if you type 78764357878563812 in chrome or in safari, then you get

If you do

for(var i = 0; i < 30; i++){console.log(i + \" == \" + 7876435787856         


        

Answer 1

There are no integers in Javascript.

Numbers are double precision floating point, which gives you a precision of 15-16 digits. This is consistent with your results.