The Number function changes the datatype of the parameter to number.
Parameter: datatype
Any number, string, date, time, or boolean value. This can come from a source node, the result of a function, or a value you specify.
Returns: number
The numeric value of the parameter or NaN (not a number). The conversion rules depend on the datatype of the parameter:
n or -n
n. or -n.
n.n or -n.n
.n or -.n
NaN for any other value