Javascript - convert mixed fraction to decimal

Question

I have a series of recipe ingredients listed like "1-1/2" which I need to change to a proper number like "1.5" in order to calculate according to serving sizes. How do I change the mixed fraction to a decimal number? I've seen the eval function, which works for things like "1/2", but for something like "1-1/2" it evaluates it as ".5".

Thanks for your help!

Answer 1

Note: Add your safety checks (like ensuring there is a "-" in the input etc.)

Code:

function toDecimal(_x) {
   var parts = _x.split("-");
   var decParts = parts[1].split("/");
   return parseInt(parts[0], 10) + 
             (parseInt(decParts[0], 10) / parseInt(decParts[1], 10));
}
var x = "1-1/2";
console.log(toDecimal(x));