Typescript ternary operator short form

Question

I am inside a for loop trying to add up a number. The code is working fine, but I was asking myself if there might be shorter form for the following line:

price = ve.select ? price + ve.price : price;

if ve.select is true, the price is increased by ve.price, if its false, then price stays. I am searching for something similar like this line (I know this code snippet does not work):

price = ve.select ? price + ve.price;

Answer 1

You have several options:

1. An if statement

   if (ve.select) {
       price += ve.price;
   }
   

   Or if you prefer it on one line:

   if (ve.select) price += ve.price;
   

2. The conditional operator version you've shown:

   price = ve.select ? price + ve.price : price;
   

   ...but note that it does an unnecessary assignment when ve.select is falsy (though as price is presumably a simple variable that's not an issue; with an object property that might be an accessor property it can matter).

3. Using the && (logical AND) operator:

   ve.select && price += ve.price;
   

   But note that this is really just an if statement in disguise.

4. Tamás Sallai's answer providing an alternative use of the conditional operator (price += ve.select ? ve.price : 0;).

Answer 2

I'd reverse the ternary and use +=:

price += ve.select ? ve.price : 0;