fprintf(stderr, "Failed to write to memory: %s\n", mach_error_string(kr));
This downloads the package from a JS CDN and adds it to your vendor directory and updates your config/importmap.rb. The package then gets automatically included in your application with the javascript_importmap_tags ERB tag included in the of the default HTML templates. You can see how this gets expanded if you look at the source of any generated page in your browser:
，这一点在wps中也有详细论述
Consider what would be involved in the execution of foldTree. It takes three arguments: an accumulator, a tree, and a function. It spawns zero or one recursive child calls. It produces a return value after running.
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