Question

In a file I am looking at, I saw a || statement in a javascript function call what does it mean?

createObject(a_variable || b_variable)

Does the function take in a true/false value or it take in something else?

is the above code equivalent to

createanotherObject(a_variable ? a_variable : b_variable)

Which I saw right next to it.

Answer 1

Yes. They both do almost exactly the same thing (the first one is slightly more efficient). It’ll pass the first truthy value (or the last one – if none are truthy).

Your code is equivalent to this:

var argument = a_variable;

if ( ! argument ) argument = b_variable;

createObject( argument );