Logical operators

Logical operators are generally used with bool values.

As logical expressions are evaluated left to right, they are tested for possible “short-circuit” evaluation. This means that the evaluation of an expression is stopped when the outcome is determined. This applies in the following two cases:

• expression_1 && expression_2 : if expression_1 evaluates to false then expression_2 is not evaluated. Any side effects of doing so do not take place.

• expression_1 || expression_2: if expression_1 evaluates to true then expression_2 is not evaluated. Any side effects of doing so do not take place.

Logical short-circuit examples:

x = 0;
[
    false && x += 1,
    true || x += 1,
    x
];  // expression x += 1 will never be executed

Return value in JSON format

[
    false,
    true,
    0
]