How to convert a string to a number using JavaScript?

Q

How to convert a string to a number using JavaScript?

✍: Guest

A

You can use the parseInt() and parseFloat() methods. Notice that extra letters following a valid number are ignored, which is kinda wierd but convenient at times.

parseInt("100") ==> 100

parseFloat("98.6") ==> 98.6

parseFloat("98.6 is a common temperature.") ==> 98.6 

parseInt("aa") ==> Nan //Not a Number

parseInt("aa",16) ==> 170 //you can supply a radix or base

2011-06-21, 2941👍, 0💬