Javascript: Converting String to Number?

Question

Is there any way to convert a variable from string to number?

For example, I have

var str = "1";

Can I change it to

var str = 1;

Answer 1

Try str = parseInt( str, 10 )

(note: the second parameter signifies the radix for parsing; in this case, your number will be parsed as a decimal)

That being said, however, the term "type" is used quite loosely in JavaScript. Could you explain why are you concerned with variable's type at all?

Answer 2

There are three ways to do this:

str = parseInt(str, 10); // 10 as the radix sets parseInt to expect decimals

or

str = new Number(str); // this does not support octals

or

str = +str; // the + operator causes the parser to convert using Number

Choose wisely :)