The Crow Programming Language
SpecGitHub

Formatting

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x = 1234.5678
log[fmt[x, decimals = 2]]
log[fmt[x, decimals = 1, commas = true]]
log[fmt[0.256, percent = true, decimals = 1]]
log[fmt[42, width = 6]]
log[fmt[42, width = 6, fill = '0']]
log[fmt['ab', width = 5, align = 'right']]

expected output — from the book, verified by crow test --book

1234.57
1,234.6
25.6%
    42
000042
   ab

Reference: spec section 11 (Formatting).