How can I prevent a string value from getting rounded when converted to a number value?

Question

I have an input field that accepts numeric values. I'd like to find a method that converts that that string value into a number value.

ParseInt() was what first came to find, then toFixed().

What do these have in common? It rounds the values to its Integer value (like ParseInt suggests--I know!).

How can I convert a string representation into a number value while retaining any decimal values?

ex:

"54.3" --> 54.3

Answer 1

An integer is a whole number.

A Float is a number with decimal values.

Knowing this you will want to use parseFloat(), which will take the period into consideration; instead of parseInt() which will round to the nearest whole number.

Refer to: these docs for more detailed information

So the answer is:

parseFloat("string");

you can also do this which is known as a unary plus:

let a = "54.3"

a = +a;

Doing +a is practically the same as doing a * 1; it converts the value in a to a number if needed, but after that it doesn't change the value.

Answer 2

You can use:

//pass String as argument
var floatVal = parseFloat("54.3");
console.log(floatVal);