Returns the SI prefix for magnitude.

Number.si_prefix(3) # => 'k'

Returns self.

Divides self by other using floored division.

The result will be of the same type as self.

The comparison operator. Returns 0 if the two objects are equal, a negative number if this object is considered less than other, a positive number if this object is considered greter than other, or nil if the two objects are not comparable.

Subclasses define this method to provide class-specific ordering.

The comparison operator is usually used to sort values:

# Sort in a descending way:
[3, 1, 2].sort { |x, y| y <=> x } # => [3, 2, 1]

# Sort in an ascending way:
[3, 1, 2].sort { |x, y| x <=> y } # => [1, 2, 3]

The comparison operator.

Returns:

• -1 if self is less than other
• 0 if self is equal to other
• -1 if self is greater than other
• nil if self is NaN or other is NaN, because NaN values are not comparable

Returns the absolute value of this number.

123.abs  # => 123
-123.abs # => 123

Returns the square of self (self * self).

4.abs2   # => 16
1.5.abs2 # => 2.25

Returns a Tuple of two elements containing the quotient and modulus obtained by dividing self by number.

11.divmod(3)  # => {3, 2}
11.divmod(-3) # => {-4, -1}

Prints this number as a String using a customizable format.

separator is used as decimal separator, delimiter as thousands delimiter between batches of group digits.

If decimal_places is nil, all significant decimal places are printed (similar to #to_s). If the argument has a numeric value, the number of visible decimal places will be fixed to that amount.

Trailing zeros are omitted if only_significant is true.

123_456.789.format                                            # => "123,456.789"
123_456.789.format(',', '.')                                  # => "123.456,789"
123_456.789.format(decimal_places: 2)                         # => "123,456.79"
123_456.789.format(decimal_places: 6)                         # => "123,456.789000"
123_456.789.format(decimal_places: 6, only_significant: true) # => "123,456.789"

Prints this number as a String using a customizable format.

separator is used as decimal separator, delimiter as thousands delimiter between batches of group digits.

If decimal_places is nil, all significant decimal places are printed (similar to #to_s). If the argument has a numeric value, the number of visible decimal places will be fixed to that amount.

Trailing zeros are omitted if only_significant is true.

123_456.789.format                                            # => "123,456.789"
123_456.789.format(',', '.')                                  # => "123.456,789"
123_456.789.format(decimal_places: 2)                         # => "123,456.79"
123_456.789.format(decimal_places: 6)                         # => "123,456.789000"
123_456.789.format(decimal_places: 6, only_significant: true) # => "123,456.789"

Pretty prints this number as a String in a human-readable format.

This is particularly useful if a number can have a wide value range and the exact value is less relevant.

It rounds the number to the nearest thousands magnitude with precision number of significant digits. The order of magnitude is expressed with an appended quantifier. By default, SI prefixes are used (see SI_PREFIXES).

1_200_000_000.humanize # => "1.2G"
0.000_000_012.humanize # => "12.0n"

If significant is false, the number of precision digits is preserved after the decimal separator.

1_234.567_890.humanize(precision: 2)                     # => "1.2k"
1_234.567_890.humanize(precision: 2, significant: false) # => "1.23k"

separator describes the decimal separator, delimiter the thousands delimiter (see #format).

See Int#humanize_bytes to format a file size.

Pretty prints this number as a String in a human-readable format.

This is particularly useful if a number can have a wide value range and the exact value is less relevant.

It rounds the number to the nearest thousands magnitude with precision number of significant digits. The order of magnitude is expressed with an appended quantifier. By default, SI prefixes are used (see SI_PREFIXES).

1_200_000_000.humanize # => "1.2G"
0.000_000_012.humanize # => "12.0n"

If significant is false, the number of precision digits is preserved after the decimal separator.

1_234.567_890.humanize(precision: 2)                     # => "1.2k"
1_234.567_890.humanize(precision: 2, significant: false) # => "1.23k"

separator describes the decimal separator, delimiter the thousands delimiter (see #format).

This methods yields the order of magnitude and self and expects the block to return a Tuple(Int32, _) containing the (adjusted) magnitude and unit. The magnitude is typically adjusted to a multiple of 3.

def humanize_length(number)
  number.humanize do |magnitude, number|
    case magnitude
    when -2, -1 then {-2, " cm"}
    when .>=(4)
      {3, " km"}
    else
      magnitude = Number.prefix_index(magnitude)
      {magnitude, " #{Number.si_prefix(magnitude)}m"}
    end
  end
end

humanize_length(1_420) # => "1.42 km"
humanize_length(0.23)  # => "23.0 cm"

See Int#humanize_bytes to format a file size.

Pretty prints this number as a String in a human-readable format.

This is particularly useful if a number can have a wide value range and the exact value is less relevant.

It rounds the number to the nearest thousands magnitude with precision number of significant digits. The order of magnitude is expressed with an appended quantifier. By default, SI prefixes are used (see SI_PREFIXES).

1_200_000_000.humanize # => "1.2G"
0.000_000_012.humanize # => "12.0n"

If significant is false, the number of precision digits is preserved after the decimal separator.

1_234.567_890.humanize(precision: 2)                     # => "1.2k"
1_234.567_890.humanize(precision: 2, significant: false) # => "1.23k"

separator describes the decimal separator, delimiter the thousands delimiter (see #format).

This methods yields the order of magnitude and self and expects the block to return a Tuple(Int32, _) containing the (adjusted) magnitude and unit. The magnitude is typically adjusted to a multiple of 3.

def humanize_length(number)
  number.humanize do |magnitude, number|
    case magnitude
    when -2, -1 then {-2, " cm"}
    when .>=(4)
      {3, " km"}
    else
      magnitude = Number.prefix_index(magnitude)
      {magnitude, " #{Number.si_prefix(magnitude)}m"}
    end
  end
end

humanize_length(1_420) # => "1.42 km"
humanize_length(0.23)  # => "23.0 cm"

See Int#humanize_bytes to format a file size.

Pretty prints this number as a String in a human-readable format.

This is particularly useful if a number can have a wide value range and the exact value is less relevant.

It rounds the number to the nearest thousands magnitude with precision number of significant digits. The order of magnitude is expressed with an appended quantifier. By default, SI prefixes are used (see SI_PREFIXES).

1_200_000_000.humanize # => "1.2G"
0.000_000_012.humanize # => "12.0n"

If significant is false, the number of precision digits is preserved after the decimal separator.

1_234.567_890.humanize(precision: 2)                     # => "1.2k"
1_234.567_890.humanize(precision: 2, significant: false) # => "1.23k"

separator describes the decimal separator, delimiter the thousands delimiter (see #format).

This methods yields the order of magnitude and self and expects the block to return a Tuple(Int32, _) containing the (adjusted) magnitude and unit. The magnitude is typically adjusted to a multiple of 3.

def humanize_length(number)
  number.humanize do |magnitude, number|
    case magnitude
    when -2, -1 then {-2, " cm"}
    when .>=(4)
      {3, " km"}
    else
      magnitude = Number.prefix_index(magnitude)
      {magnitude, " #{Number.si_prefix(magnitude)}m"}
    end
  end
end

humanize_length(1_420) # => "1.42 km"
humanize_length(0.23)  # => "23.0 cm"

See Int#humanize_bytes to format a file size.

Pretty prints this number as a String in a human-readable format.

This is particularly useful if a number can have a wide value range and the exact value is less relevant.

It rounds the number to the nearest thousands magnitude with precision number of significant digits. The order of magnitude is expressed with an appended quantifier. By default, SI prefixes are used (see SI_PREFIXES).

1_200_000_000.humanize # => "1.2G"
0.000_000_012.humanize # => "12.0n"

If significant is false, the number of precision digits is preserved after the decimal separator.

1_234.567_890.humanize(precision: 2)                     # => "1.2k"
1_234.567_890.humanize(precision: 2, significant: false) # => "1.23k"

separator describes the decimal separator, delimiter the thousands delimiter (see #format).

See Int#humanize_bytes to format a file size.

Pretty prints this number as a String in a human-readable format.

This is particularly useful if a number can have a wide value range and the exact value is less relevant.

It rounds the number to the nearest thousands magnitude with precision number of significant digits. The order of magnitude is expressed with an appended quantifier. By default, SI prefixes are used (see SI_PREFIXES).

1_200_000_000.humanize # => "1.2G"
0.000_000_012.humanize # => "12.0n"

If significant is false, the number of precision digits is preserved after the decimal separator.

1_234.567_890.humanize(precision: 2)                     # => "1.2k"
1_234.567_890.humanize(precision: 2, significant: false) # => "1.23k"

separator describes the decimal separator, delimiter the thousands delimiter (see #format).

This methods yields the order of magnitude and self and expects the block to return a Tuple(Int32, _) containing the (adjusted) magnitude and unit. The magnitude is typically adjusted to a multiple of 3.

def humanize_length(number)
  number.humanize do |magnitude, number|
    case magnitude
    when -2, -1 then {-2, " cm"}
    when .>=(4)
      {3, " km"}
    else
      magnitude = Number.prefix_index(magnitude)
      {magnitude, " #{Number.si_prefix(magnitude)}m"}
    end
  end
end

humanize_length(1_420) # => "1.42 km"
humanize_length(0.23)  # => "23.0 cm"

See Int#humanize_bytes to format a file size.

Rounds this number to a given precision in decimal digits.

-1763.116.round(2) # => -1763.12

Returns the sign of this number as an Int32.

• -1 if this number is negative
• 0 if this number is zero
• 1 if this number is positive

123.sign # => 1
0.sign   # => 0
-42.sign # => -1

Keeps digits significants digits of this number in the given base.

1234.567.significant(1) # => 1000
1234.567.significant(2) # => 1200
1234.567.significant(3) # => 1230
1234.567.significant(4) # => 1235
1234.567.significant(5) # => 1234.6
1234.567.significant(6) # => 1234.57
1234.567.significant(7) # => 1234.567
1234.567.significant(8) # => 1234.567

15.159.significant(1, base = 2) # => 16

Invokes the given block with the sequence of numbers starting at self, incremented by by on each call, and with an optional to.

3.step(to: 10, by: 2) do |n|
  puts n
end

Output:

3
5
7
9

Returns true if value is equal to zero.

0.zero? # => true
5.zero? # => false

Creates an Array of self with the given values, which will be casted to this type with the new method (defined in each Number type).

floats = Float64[1, 2, 3, 4]
floats.class # => Array(Float64)

ints = Int64[1, 2, 3]
ints.class # => Array(Int64)

Creates a Slice of self with the given values, which will be casted to this type with the new method (defined in each Number type).

The slice is allocated on the heap.

floats = Float64.slice(1, 2, 3, 4)
floats.class # => Slice(Float64)

ints = Int64.slice(1, 2, 3)
ints.class # => Slice(Int64)

Creates a StaticArray of self with the given values, which will be casted to this type with the new method (defined in each Number type).

floats = Float64.static_array(1, 2, 3, 4)
floats.class # => StaticArray(Float64, 4)

ints = Int64.static_array(1, 2, 3)
ints.class # => StaticArray(Int64, 3)