Number.parseFloat()

The Number.parseFloat() method parses an argument and returns a floating point number. If a number cannot be parsed from the argument, it returns NaN.

Number.parseFloat(string)

string

The value to parse. If this argument is not a string, then it is converted to one using the ToString abstract operation. Leading whitespace in this argument is ignored.

A floating point number parsed from the given string.

Or NaN when the first non-whitespace character cannot be converted to a number.

if (Number.parseFloat === undefined) {
  Number.parseFloat = parseFloat;
}

This method has the same functionality as the global parseFloat() function:

Number.parseFloat === parseFloat; // true

This method is also part of ECMAScript 2015. (Its purpose is modularization of globals.)

See parseFloat() for more detail and examples.

• Number

  The object this method belongs to.

• The global parseFloat() method.