&&, ||, ??
Operators can use ANY data type, return ANY data type, and can be used for short-circuiting
console.log(3 || 'Nothing'); // returns the first truthy value (3)
console.log('' || 'Nothing')// Nothing
console.log(true || 'Alternative') // true
console.log(undefined || null) // null (null is truthy, undefined is not
Returns the first true value of an argument and then stops (short-circuits)
Can use this instead of terniary arguments
const myVar = trueArgument ? trueArgument : falseAction;
const myVar = argument || falsAction;&& operator works in the opposite way
Will return the first falsey or all of them if they are all truthy
myFunction && myFunction('arg'); Checks that functions exists, if not then argument ends.?? Nullish Coalescing Operator
This is used to avoid the issue if 0 should not be a falsey value.
Nullish: null and undefined only (not 0 or ”)
Other logical operators (ES6)
||=, &&=, ??=
myVariable ??= 10; // sets value to 10 if it is nullish
myVariable &&= '<anonymous>'; // resets value to annonymous if it exists