One question: Which means plus(+) before process.env?
port: process.env.POSTGRESQL_PORT ? +process.env.POSTGRESQL_PORT : 5432
Asked
Active
Viewed 37 times
2
-
Well, have you try it to find out yourself? – Vucko Jul 17 '20 at 17:58
-
It is the [unary plus operator](https://stackoverflow.com/questions/727516/what-does-the-unary-plus-operator-do/727518) that converts an operand to a number. – Unmitigated Jul 17 '20 at 17:58
-
This is too in typescript or javascript? – Jul 17 '20 at 17:59
-
@halohalohalo Yes. – Unmitigated Jul 17 '20 at 18:02
1 Answers
4
It's the unary plus (+) operator.
It precedes its operand and evaluates to its operand but attempts to convert it into a number, if it isn't already.
const x = 1;
const y = -1;
console.log(+x);
// expected output: 1
console.log(+y);
// expected output: -1
console.log(+'');
// expected output: 0
console.log(+true);
// expected output: 1
console.log(+false);
// expected output: 0
console.log(+'hello');
// expected output: NaN
Telmo Trooper
- 4,993
- 1
- 30
- 35