The parseFloat() function extracts a floating-point number from a string.
-
It converts each character in the string to integer,
until it encounters a non-numerical value
except the decimal . and exponent e or E notations.
-
It returns NaN if the string does not start with
a numerical value, +, -, or ..
-
It returns Infinity for "Infinity"
and
-Infinity for "-Infinity".
In the example given above,
the parseFloat() function converts the first set of numerical characters
and
decimal point,
i.e., "12.34" to a floating-point number.
Since the next character "p" is a non-numerical,
the function stops execution
and
returns 12.34.