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mathjs/src/function/utils/numeric.js at develop · husayt/mathjs · GitHub
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utils
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numeric.js
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function
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utils
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numeric.js
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import
{
typeOf
}
from
'../../utils/is.js'
import
{
factory
}
from
'../../utils/factory.js'
import
{
noBignumber
,
noFraction
}
from
'../../utils/noop.js'
const
name
=
'numeric'
const
dependencies
=
[
'number'
,
'?bignumber'
,
'?fraction'
]
export
const
createNumeric
=
/* #__PURE__ */
factory
(
name
,
dependencies
,
(
{
number
,
bignumber
,
fraction
}
)
=>
{
const
validInputTypes
=
{
string
:
true
,
number
:
true
,
BigNumber
:
true
,
Fraction
:
true
}
// Load the conversion functions for each output type
const
validOutputTypes
=
{
number
:
(
x
)
=>
number
(
x
)
,
BigNumber
:
bignumber
?
(
x
)
=>
bignumber
(
x
)
:
noBignumber
,
bigint
:
(
x
)
=>
BigInt
(
x
)
,
Fraction
:
fraction
?
(
x
)
=>
fraction
(
x
)
:
noFraction
}
/**
* Convert a numeric input to a specific numeric type: number, BigNumber, bigint, or Fraction.
*
* Syntax:
*
* math.numeric(x)
* math.numeric(value, outputType)
*
* Examples:
*
* math.numeric('4') // returns 4
* math.numeric('4', 'number') // returns 4
* math.numeric('4', 'bigint') // returns 4n
* math.numeric('4', 'BigNumber') // returns BigNumber 4
* math.numeric('4', 'Fraction') // returns Fraction 4
* math.numeric(4, 'Fraction') // returns Fraction 4
* math.numeric(math.fraction(2, 5), 'number') // returns 0.4
*
* See also:
*
* number, fraction, bignumber, bigint, string, format
*
*
@param
{
string | number | BigNumber | bigint | Fraction
} value
* A numeric value or a string containing a numeric value
*
@param
{
string
} outputType
* Desired numeric output type.
* Available values: 'number', 'BigNumber', or 'Fraction'
*
@return
{
number | BigNumber | bigint | Fraction
}
* Returns an instance of the numeric in the requested type
*/
return
function
numeric
(
value
,
outputType
=
'number'
,
check
)
{
if
(
check
!==
undefined
)
{
throw
new
SyntaxError
(
'numeric() takes one or two arguments'
)
}
const
inputType
=
typeOf
(
value
)
if
(
!
(
inputType
in
validInputTypes
)
)
{
throw
new
TypeError
(
'Cannot convert '
+
value
+
' of type "'
+
inputType
+
'"; valid input types are '
+
Object
.
keys
(
validInputTypes
)
.
join
(
', '
)
)
}
if
(
!
(
outputType
in
validOutputTypes
)
)
{
throw
new
TypeError
(
'Cannot convert '
+
value
+
' to type "'
+
outputType
+
'"; valid output types are '
+
Object
.
keys
(
validOutputTypes
)
.
join
(
', '
)
)
}
if
(
outputType
===
inputType
)
{
return
value
}
else
{
return
validOutputTypes
[
outputType
]
(
value
)
}
}
}
)
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