JS string conversion to digital summary

A. A lack of skills to convert a string to a number but it is clear that the numbers () constructor is called as a function:

var number = number (string_value);

B. parseint () intercepts only integers, if a string begins with "0x" or "0X", parseint () resolves it to a hexadecimal number, parseint () can even accept a parameter to specify the cardinality of the number to parse, with a valid value between 2 and 36

parseint ("3 Blind Mice"); Returns 3
parseint ("12.34"); Returns 12
parseint ("0xFF"); Returns 255
parseint ("11", 2); Returns 3 (1 * 2 + 1)
parseint ("FF", 16); Returns 255 (15 * 16 + 15)
parseint ("ZZ", 36); Returns 1295 (35 * 36 + 35)
parseint ("077", 8); Returns 63 (7 * 8 + 7)
parseint ("077", 10); Returns 77 (7 * 10 + 7)

C. parsefloat () intercepts integers and floating-point numbers.

Parsefloat ("3.14 meters"); Returns 3.14

D. If parseint () and parsefloat () are not able to convert the specified string to a number, they return Nan:

parseint (' eleven '); Returns Nan
Parsefloat ("$72.47"); Returns NaN

How JavaScript is rounded

A. Discard the fractional part, preserving the integral portion of the
parseint (5/2)

B. Rounding up, with decimals on the integer part plus 1

Math.ceil (5/2)

C. Rounding down

Math.floor (5/2)

D. Rounding

Math.Round (5/2)

JS string conversion to digital summary