RSpec
Ruby on Rails
Ruby
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json_create
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new
(<= v1_8_7_330)
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new!
(<= v1_8_7_330)
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reduce
(<= v1_8_7_330)
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yaml_new
(<= v1_9_1_378)
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<=>
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==
-
-
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-@
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/
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//
(<= v2_2_9)
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*
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**
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%
(<= v1_9_1_378)
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+
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abs
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as_json
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ceil
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coerce
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denominator
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div
(<= v1_9_1_378)
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divmod
(<= v1_9_1_378)
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exact?
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fdiv
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floor
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hash
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inspect
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magnitude
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marshal_dump
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marshal_load
(<= v1_9_3_392)
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modulo
(<= v1_9_1_378)
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negative?
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numerator
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positive?
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power2
(<= v1_8_7_330)
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quo
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quot
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quotrem
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rational?
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rationalize
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remainder
(<= v1_9_1_378)
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round
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to_d
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to_f
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to_i
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to_json
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to_r
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to_s
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to_yaml
(<= v1_9_1_378)
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truncate
= private
= protected
round(*args, p2 = {})
public
Returns rat rounded to the nearest value with a precision of ndigits decimal digits (default: 0).
When the precision is negative, the returned value is an integer with at least ndigits.abs trailing zeros.
Returns a rational when ndigits is positive, otherwise returns an integer.
Rational(3).round #=> 3 Rational(2, 3).round #=> 1 Rational(-3, 2).round #=> -2 # decimal - 1 2 3 . 4 5 6 # ^ ^ ^ ^ ^ ^ # precision -3 -2 -1 0 +1 +2 Rational('-123.456').round(+1).to_f #=> -123.5 Rational('-123.456').round(-1) #=> -120
The optional half keyword argument is available similar to Float#round.
Rational(25, 100).round(1, half: :up) #=> (3/10) Rational(25, 100).round(1, half: :down) #=> (1/5) Rational(25, 100).round(1, half: :even) #=> (1/5) Rational(35, 100).round(1, half: :up) #=> (2/5) Rational(35, 100).round(1, half: :down) #=> (3/10) Rational(35, 100).round(1, half: :even) #=> (2/5) Rational(-25, 100).round(1, half: :up) #=> (-3/10) Rational(-25, 100).round(1, half: :down) #=> (-1/5) Rational(-25, 100).round(1, half: :even) #=> (-1/5)
