This website requires JavaScript.
Explore
Help
Sign In
gaspersic
/
freeCodeCamp
Watch
1
Star
0
Fork
0
You've already forked freeCodeCamp
Code
Issues
Pull Requests
Projects
Releases
Wiki
Activity
Files
fce8901c564db2bbbf653c491ec4a7a6b327ab9f
freeCodeCamp
/
guide
/
russian
/
certifications
/
javascript-algorithms-and-data-structures
/
es6
/
prevent-object-mutation
History
…
..
index.md
…