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mathjs/src/function/arithmetic/unaryPlus.js at develop · siapble/mathjs · GitHub
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mathjs
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src
/
function
/
arithmetic
/
unaryPlus.js
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mathjs
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src
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function
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arithmetic
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unaryPlus.js
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'use strict'
const
deepMap
=
require
(
'../../utils/collection/deepMap'
)
function
factory
(
type
,
config
,
load
,
typed
)
{
const
latex
=
require
(
'../../utils/latex'
)
/**
* Unary plus operation.
* Boolean values and strings will be converted to a number, numeric values will be returned as is.
*
* For matrices, the function is evaluated element wise.
*
* Syntax:
*
* math.unaryPlus(x)
*
* Examples:
*
* math.unaryPlus(3.5) // returns 3.5
* math.unaryPlus(1) // returns 1
*
* See also:
*
* unaryMinus, add, subtract
*
*
@param
{
number | BigNumber | Fraction | string | Complex | Unit | Array | Matrix
} x
* Input value
*
@return
{
number | BigNumber | Fraction | Complex | Unit | Array | Matrix
}
* Returns the input value when numeric, converts to a number when input is non-numeric.
*/
const
unaryPlus
=
typed
(
'unaryPlus'
,
{
'number'
:
function
(
x
)
{
return
x
}
,
'Complex'
:
function
(
x
)
{
return
x
// complex numbers are immutable
}
,
'BigNumber'
:
function
(
x
)
{
return
x
// bignumbers are immutable
}
,
'Fraction'
:
function
(
x
)
{
return
x
// fractions are immutable
}
,
'Unit'
:
function
(
x
)
{
return
x
.
clone
(
)
}
,
'Array | Matrix'
:
function
(
x
)
{
// deep map collection, skip zeros since unaryPlus(0) = 0
return
deepMap
(
x
,
unaryPlus
,
true
)
}
,
'boolean | string'
:
function
(
x
)
{
// convert to a number or bignumber
return
(
config
.
number
===
'BigNumber'
)
?
new
type
.
BigNumber
(
+
x
)
:
+
x
}
}
)
unaryPlus
.
toTex
=
{
1
:
`
${
latex
.
operators
[
'unaryPlus'
]
}
\\left(\${args[0]}\\right)`
}
return
unaryPlus
}
exports
.
name
=
'unaryPlus'
exports
.
factory
=
factory
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