5.0 KiB
FixedNumber
A FixedNumber is a fixed-width (in bits) number with an internal base-10 divisor, which allows it to represent a decimal fractional component.
Creating Instances
The FixedNumber constructor cannot be called directly. There are several static methods for creating a FixedNumber.
FixedNumber . from ( value [ , format="fixed" ] ) => FixedNumber
Returns an instance of a FixedNumber for value as a format.
FixedNumber . fromBytes ( aBytesLike [ , format="fixed" ] ) => FixedNumber
Returns an instance of a FixedNumber for value as a format.
FixedNumber . fromString ( value [ , format="fixed" ] ) => FixedNumber
Returns an instance of a FixedNumber for value as a format. The value must not contain more decimals than the format permits.
FixedNumber . fromValue ( value [ , decimals=0 [ , format="fixed" ] ] ) => FixedNumber
Returns an instance of a FixedNumber for value with decimals as a format.
Properties
fixednumber . format
The FixedFormat of fixednumber.
Methods
Math Operations
fixednumber . addUnsafe ( otherValue ) => FixedNumber
Returns a new FixedNumber with the value of fixedvalue + otherValue.
fixednumber . subUnsafe ( otherValue ) => FixedNumber
Returns a new FixedNumber with the value of fixedvalue – otherValue.
fixednumber . mulUnsafe ( otherValue ) => FixedNumber
Returns a new FixedNumber with the value of fixedvalue × otherValue.
fixednumber . divUnsafe ( otherValue ) => FixedNumber
Returns a new FixedNumber with the value of fixedvalue ÷ otherValue.
fixednumber . round ( [ decimals=0 ] ) => FixedNumber
Returns a new FixedNumber with the value of fixedvalue rounded to decimals.
Conversion
fixednumber . toFormat ( format ) => FixedNumber
Returns a new FixedNumber with the value of fixedvalue with format.
fixednumber . toHexString ( ) => string
Returns a Hexstring representation of fixednumber.
fixednumber . toString ( ) => string
Returns a string representation of fixednumber.
fixednumber . toUnsafeFloat ( ) => float
Returns a floating-point JavaScript number value of fixednumber. Due to rounding in JavaScript numbers, the value is only approximate.
Inspection
FixedNumber . isFixedNumber ( value ) => boolean
Returns true if and only if value is a FixedNumber.
FixedFormat
A FixedFormat is a simple object which represents a decimal (base-10) Fixed-Point data representation. Usually using this class directly is uneccessary, as passing in a Format Strings directly into the FixedNumber will automatically create this.
Format Strings
A format string is composed of three components, including signed-ness, bit-width and number of decimals.
A signed format string begins with fixed, which an unsigned format
string begins with ufixed, followed by the width (in bits) and the
number of decimals.
The width must be conguent to 0 mod 8 (i.e. (width % 8) == 0) and no
larger than 256 bits and the number of decimals must be no larger than 80.
For example:
- fixed128x18 is signed, 128 bits wide and has 18 decimals; this is useful for most purposes
- fixed32x0 is signed, 32 bits wide and has 0 decimals; this would be the same as a ``int32_t` in C
- ufixed32x0 is unsigned, 32 bits wide and has 0 decimals; this would be the same as a ``uint32_t` in C
- fixed is shorthand for ``fixed128x18`
- ufixed is shorthand for ``ufixed128x18`
Creating Instances
FixedFormat . from ( value="fixed128x18" ) => FixedFormat
Returns a new instance of a FixedFormat defined by value. Any valid Format Strings
may be passed in as well as any object which has any of signed, width and decimals
defined, including a FixedFormat object.
Properties
fixedFormat . signed => boolean
The signed-ness of fixedFormat, true if negative values are supported.
fixedFormat . width => number
The width (in bits) of fixedFormat.
fixedFormat . decimals => number
The number of decimal points of fixedFormat.
fixedFormat . name => string
The name of the fixedFormat, which can be used to recreate the format and is the string that the Solidity language uses to represent this format.
"fixed"
A shorthand for fixed128x80.
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