Keep line length to 80
Avoid non-`nil` checks in examples
Merge pull request #341 from yous/patch-avoid-non-nil-checks

Avoid non nil checks in examples
Add Korean ver
Change Link for renamed file
Fix reference to "braces" where "parentheses" was meant.
Merge pull request #343 from bk2204/parentheses-typo

Fix reference to "braces" where "parentheses" was meant.
Merge pull request #342 from dalzony/korean

Add Korean ver
fix 'bad' example for '&&='
Merge pull request #345 from ShPakvel/fix_double_amper_process_bad_example

fix 'bad' example for '&&='