JavaScript Reference: Number parseFloat() method

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Parses the argument as a float number and returns it. The argument is a string:

Number.parseFloat('10') //10
Number.parseFloat('10.00') //10
Number.parseFloat('237,21') //237
Number.parseFloat('237.21') //237.21
Number.parseFloat('12 34 56') //12
Number.parseFloat(' 36 ') //36
Number.parseFloat('36 is my age') //36

Number.parseFloat('-10') //-10
Number.parseFloat('-10.2') //-10.2

As you can see Number.parseFloat() is pretty flexible. It can also convert strings with words, extracting the first number, but the string must start with a number:

Number.parseFloat('I am Flavio and I am 36') //NaN

It only handles radix 10 numbers.