ゼロ埋め
s = "1" print s.zfill(3) # => 001
s = "1" p s.rjust(3, '0') # => 001
javascript
sliceを使って
var s = "1" ("000" + s).slice(-3) # => 001
s = "1" print s.zfill(3) # => 001
s = "1" p s.rjust(3, '0') # => 001
javascript
sliceを使って
var s = "1" ("000" + s).slice(-3) # => 001