Ruby class Numeric interactive

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Methods

Querying

finite?1.finite?; (1.0/0).finite? # true;false Documentation Playground

(1.0/0).finite?

false

infinite?1.infinite?; (1.0/0).infinite? # nil;1 Documentation Playground

(-1.0/0).infinite?.inspect

-1

integer?1.integer?; 1.0.integer? # true;false Documentation Playground

1.integer?

true

positive?1.positive?; -1.positive? # true;false Documentation Playground

1.positive?

true

negative?-1.negative?; 1.negative? # true;false Documentation Playground

-1.negative?

true

zero?0.zero?; 7.zero? # true;false Documentation Playground

0.zero?

true

nonzero?7.nonzero?; 0.nonzero? # 7;nil Documentation Playground

7.nonzero?.inspect

7

real?1.real?; Complex::I.real? # true;false Documentation Playground

0.real?

true

Comparing

<=>1<=>2; 1<=>1; 2<=>1 # -1;0;1 Documentation Playground

1 <=> 2

-1

eql?1.eql?(1);1.eql?(1.0) # true;false;false Documentation Playground

1.eql?(1)

true

Converting

% (alias modulo)11 % 3; 11.modulo(3) # 2 Documentation Playground

11 % 3

2

@ (self)n=99; n; -n # 99;-99 Documentation Playground

n=99; -n

-99

abs (alias magnitude)-12.36.abs # 1236 Documentation Playground

-12.36.abs

12.36

abs2-3.abs2 # 9 Documentation Playground

-3.abs2

9

arg (alias angle phase)Complex(-1, 0).arg # 3.14159 Documentation Playground

Complex(-1, 0).arg

3.141592653589793

round12.36.round(1); 1236.round(-1) # 12.4;1240 Documentation Playground

12.36.round(1)

12.4

ceil12.36.ceil(1); 1236.ceil(-1) # 12.4;1240 Documentation Playground

12.36.ceil(1)

12.4

floor12.36.floor(1); 1236.floor(-1) # 12.3;1230 Documentation Playground

12.36.floor(1)

12.3

truncate12.36.truncate(1); 1236.truncate(-1) # 12.3;1230 Documentation Playground

12.36.truncate(1)

12.3

coerce1.coerce(2); 1.coerce(2.0) # [2,1];[2.0,1.0] Documentation Playground

1.coerce(2.0)

[2.0, 1.0]

conj (alias conjugate)Complex(3,4).conjugate # (3-4i) Documentation Playground

# real numbers are unchanged
Complex(5,0).conjugate.inspect

(5+0i)

numeratorr=Rational(6,8); r.numerator # (3/4);3 Documentation Playground

r=Rational(6,8)
r.inspect + '; ' + r.numerator.inspect

(3/4); 3

denominatorr=Rational(6,8); r.denominator # (3/4);4 Documentation Playground

r=Rational(6,8)
r.inspect + '; ' + r.numerator.inspect + '; ' + r.denominator.inspect

(3/4); 3; 4

div7.div(2) # 3 Documentation Playground

7.div(2)

3

fdiv7.fdiv(2) # 3.5 Documentation Playground

7.fdiv(2)

3.5

divmod11.divmod(3) # [3,2] Documentation Playground

11.divmod(3)

[3, 2]

i 'complex'2.i; (1/4.0).i # (0+2i);(0+0.25i) Documentation Playground

2.0.i.inspect

(0+2.0i)

realComplex(3,4).real # 3 Documentation Playground

Complex(3,4).real

3

imaginary (alias imag)Complex(3,4).imaginary; # 4 Documentation Playground

Complex(3,4).imaginary

4

polarComplex(-1,0).polar # [1,3.14159] Documentation Playground

Complex(1, 1).polar

[1.4142135623730951, 0.7853981633974483]

quo1.quo(2); 1.0.quo(2) # (1/2);0.5 Documentation Playground

1.quo(2).inspect

(1/2)

rectangular (alias rect)Complex(3,4).rectangular # [3,4] Documentation Playground

Complex(3, 4).rectangular

[3, 4]

remainder11.remainder(4); 11.0.remainder(4) # 3;3.0 Documentation Playground

11.0.remainder(4)

3.0

to_c(1/4.0).to_c # (0.25+0i) Documentation Playground

(1/4.0).to_c.inspect

(0.25+0i)

to_int(9/4.0).to_int # 2 Documentation Playground

(9/4.0).to_int

2

Other

Integer, Float, Rational, Complex are always frozen (immutable value types)

clonec1=1; c2=c1.clone; c2.frozen? # true Documentation

dup (alias +@)d1=1; d2=d1.dup; d2=+d1; d2.frozen? # true Documentation

step4.step(by: 2, to: 8) {|i| p i } # 4;6;8 Documentation