test => no args
test => simple
test => array
test => mixed
test => preserve null
refactoring => inline variable
Merge branch 'flatten2' into master
add test into all-tests.html
test => declaration
test => no arguments
test => with arguments
Merge branch 'wrapped_function' into master
add test into all-tests.html
test => 5 digits
test => largest
refactoring => best practice from codewars
Merge branch 'largest_5_digit_number_in_a_series' into master
add test into all-tests.html