pub fn tonumber(v: any, base: option<number>) -> option<number>Expand description
When called with no base, tries to convert its argument to a number.
If the argument is already a number or a string convertible to a
number, returns that number; otherwise, returns nil.
When called with a base, v must be a string to be interpreted as an
integer numeral in that base (from 2 to 36, letters A–Z standing
for 10–35).
§Examples
print(tonumber("42")) --> 42
print(tonumber("0x1F")) --> 31
print(tonumber("3.7e2")) --> 370.0
print(tonumber("ff", 16)) --> 255
print(tonumber("hello")) --> nil