Converting a type of data to another type in javascript;

Question

var x="234"
I want to concert it into number data type ,

Answer 1

*BEFORE YOU READ - THIS WAS IN RESPONSE TO HIS ACTUAL CODE THAT WASNT POSTED HERE. I SUPPLIED AN ANSWER BELOW TO THE QUESTION ABOVE THOUGH.*

You deleted your other thread before I could post. Here is a solution that'll work for you buddy. Hope it helps

https://code.sololearn.com/WqzqjXnp2Fj9/#js

var s="+234+56*";
var strEnd = s.charAt(s.length-1);
var strBeg = s.charAt(0);
document.write(s+"<br>");

switch(strBeg){
case "*":
case "/":
case "-":
case "+":
document.write("Syntax Error: Invalid Beginning Char ("+ strBeg +")<br>");
break;
}

switch(strEnd){
case "*":
case "/":
case "-":
case "+":
document.write("Syntax Error: Invalid Ending Char ("+ strEnd +")<br>");
break;
}

Answer 2

what if
var c = "23+43+65*"
and I want that if last one is operator, the output should be error, I did that, using charAt() and if condition,
but problem coming when
var c="43+45+76/"
in this case my if condition not working

Answer 3

JavaScript has dynamic typing, so in most instances, it'll automatically convert the variable to the correct data type.

You can also use something like Number(), parseInt(), or parseFloat().

Number(x);
parseInt(x);
parseFloat(x);

https://www.w3schools.com/js/js_number_methods.asp
^More information if you want it. Hope it helps.

Answer 4

thanks, am trying it...

Answer 5

@Netkos Ent, very thanks for ur efforts, keep it up, as ur help can be turn on and inspiration for another...

Answer 6

@Ashish, It's my pleasure. I hope that helped you out some with understanding a couple ways you can go about it. The 'switch' method is much easier on the eyes, and much easier to maintain.

I wish you the best on your journey with JS!

Answer 7

Sorry, I'm doing my best to understand the question. What type of error do you get with the charAt() stuff? Hard for me to say without seeing your code. Here is example though:

var str = "23+43+65/";
var sl = str.length; // grab length of string so we can get last char easily
var res = str.charAt(sl-1); // this will look at the last character in your string
if(res == "/")
{
// do this if last char is "/"
}
else
{
// otherwise, do this code if it doesn't end with "/"
}