Javascript to convert string to number?

Question

var str = '0.25';

How to convert the above to 0.25?

Answer 1

There are several ways to achieve it:

Using the unary plus operator:

var n = +str;

The Number constructor:

var n = Number(str);

The parseFloat function:

var n = parseFloat(str);

Answer 2

var f = parseFloat(str);

Answer 3

var num = Number(str);