method number.power
Return _subject to the exponent power
Contract
Return typewob
Parameter keyDefault valueType
exponentreqnumber
Water Contract
<method number.power
  exponent=req=number/>
_subject can be either an integer or a number.double. exponent can be either an integer or a decimal double.
If _subject is an integer and the 'exponent' is a non-negative integer, an integer is returned, otherwise a number.double is returned.
Example:
2.<power 3/>8
Example:
2.<power 0.5/>1.4142135623730951

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