Published Jun 10 2019
JavaScript provides us 3 logical operators: and, or and not.
Returns true if both operands are true:
<expression> && <expression>
For example:
a === true && b > 3
The cool thing about this operator is that the second expression is never executed if the first evaluates to false. Which has some practical applications, for example, to check if an object is defined before using it:
const car = { color: 'green' }
const color = car && car.color
Returns true if at least one of the operands is true:
<expression> || <expression>
For example:
a === true || b > 3
This operator is very useful to fallback to a default value. For example:
const car = {}
const color = car.color || 'green'
makes color
default to green
if car.color
is not defined.
Invert the value of a boolean:
let value = true
!value //false
I wrote an entire book on this topic 👇
I also got a super cool course 👇
© 2023 Flavio Copes
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