This code is more complicated. Analyze one by one:
this.cmsStructureConfigService.getComponentsFromConfig(ids)：
Implementation of this.getComponentById:
Return from memory:
Then encapsulate it into Observable through of.
This Observable then calls pipe to assemble a switchMap function.
Function implementation of switchMap: Check if there is a Component that is not loaded from the configuration. If not, use Observable to wrap the Component in the memory; if there is, enter the IF branch on line 49 to get it:
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