Difference between rxjs of() and of ({})

I've been doing SAP Spartacus A unit test of e-commerce cloud ：

At first I return Yes. of(), Later, I found that the words written like this , The figure below map Anonymous functions within the operator do not trigger .

We can find the reason through one-step debugging ：

First, from the current Observable Extract... From the object map The operator . Every one passes pipe Processed Observable object , There is one. Operator quote .

then , Use this Operator call Observable object .

Execution section 28 Line logic ：

there this Still point to the original Observable object , and array That is, the input parameter , That is to say, the introduction of of Empty object in {}.

If change to of(), So the first 2 Yes array It's empty , So it won't enter for loop , therefore map Anonymous functions in operators , There will be no chance of implementation ：

Every map Operator All maintained a project attribute , Point to map Anonymous function passed in when calling ：

Now it's time to execute my anonymous function ：

more Jerry The original article of , All in ：“ Wang Zixi ”: