parseInt()

The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems).

The parseInt function converts its first argument to a string, parses that string, then returns an integer or NaN.

If not NaN, the return value will be the integer that is the first argument taken as a number in the specified radix. (For example, a radix of 10 converts from a decimal number, 8 converts from octal, 16 from hexadecimal, and so on.)

The radix argument is converted to a number. If it’s unprovided, or if the value becomes 0, NaN or Infinity (undefined is coerced to NaN), JavaScript assumes the following:

Syntax example: parseInt(string)