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After reading the great answer for Absolute Beginner’s Guide to Bit Shifting?
I tested the claim (sic):
3,758,096,384 << 1
from Chrome console:
3,758,096,384 << 1
> 768
3,758,096,384 << 2
> 1536
3758096384 << 1
> -1073741824
That’s the comma operator at work. It’s actually
384 << 1. (The comma operator evaluates its left hand side, then evaluates its right hand side, and returns the right hand side.)