Ternary Operator with Google Apps Script

The ternary operator allows for writing a condition on a single line like this:

condition ? value_if_true : value_if_false

Usage Example

In this example, the variable category gets a value based on a condition:

let category;

if (age >= 18) {
  category = 'Adult';
} else {
  category = 'Child';
}

Using the ternary operator, all these lines can be reduced to one:

const category = age >= 18 ? 'Adult' : 'Child';

Example with true and false

In this similar example, the variable adult gets the value true or false based on the same condition:

let adult;

if (age >= 18) {
  adult = true;
} else {
  adult = false;
}

The ternary operator is also usable in this case:

const adult = age >= 18 ? true : false;

But to only return true or false, the result of the condition is sufficient:

const adult = age >= 18;