Question

What does it mean?

1.

a==b&&b={}

2.

a==b||b={}

I didn’t find answer

Answer 1

a==b is the condition to be tested. The operators && and || test the condition very much like a ternary operator but you use it when there’s only one condition you need to test, either false || or true &&. It would be the same as:

if ( a == b ) { b = {} } // a == b && ( b = {} )
if ( a != b ) { b = {} } // a == b || ( b = {} )

But as Esailija pointed out in the comments, seems like you’re missing some parenthesis:

a == b || ( b = {} )