What is short-circuiting of logical operations ?

Question

Console.log(null || "user")
//-->user
Console.log("agnes" || "user")
//-->agnes

Why ?????

Answer 1

It means that an evaluation is stopped as soon as the result is clear.

a = true
b = false

a||b checks only a and stops right there, because the result ('at least one has to be true') is already determined.

b&&a also stops after b, because the result ('both have to be true') already failed with b being false.

Answer 2

When you want to force each part of the condition to be executed you can use the logical operators & and |.

I prepared an example which executes the different variants and prints which parts got evaluated. Finally the result for each operation.

https://code.sololearn.com/WrkrxSH8H377/?ref=app