test => no exponent
test => exponent equal decimal part length
test => exponent equal decimal part length
test => no decimal part
test => exponent more than decimal part length
refactoring => open Number class add toDecimal method
rename test.html
Merge branch 'number_to_decimal'
add test into all-tests.html
test => instances are the same
test => share state
test => best practice from codewars
Merge branch 'singleton_pattern'
add test into all-tests.html