And safer than a binary you download from an untrustworthy website or get in a suspect email attachment. It is much more securer than some of the scripts you’ll find on websites that tell you to copy-paste them into your shell.
Those observed in hacking, pen testing, and security can. Browse through source code, debug executables.
You can do anything else they can to try and find chinks in the armor.
However, once you begin going off the beaten path. It is actually likely you will get your system exploited at few point if there is even a single weak point. It only takes one really good exploit, or two or three in tandem, to fully take over a system.
Hope by this you understand is java script safe?
For waht java script is used for?