Examples of org.luaj.vm2.LuaValue.tonumber()

org.luaj.vm2.LuaValue.tonumber()

Conditionally convert to lua number without throwing errors.

In lua all numbers are strings, but not all strings are numbers. This function will return the {@link LuaValue} {@code this} if it is a number or a string convertible to a number, and {@link NIL} for all other cases.

This allows values to be tested for their "numeric-ness" without the penalty of throwing exceptions, nor the cost of converting the type and creating storage for it. @return {@code this} if it is a {@link LuaNumber}or {@link LuaString} that can be converted to a number, otherwise {@link #NIL} @see #tostring() @see #optnumber(LuaNumber) @see #checknumber() @see #toint() @see #todouble()

      }
      case 18: { // "tonumber", // (e [,base]) -> value
        LuaValue arg1 = args.checkvalue(1);
        final int base = args.optint(2,10);
        if (base == 10) {  /* standard conversion */
          return arg1.tonumber();
        } else {
          if ( base < 2 || base > 36 )
            argerror(2, "base out of range");
          return arg1.checkstring().tonumber(base);
        }

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