ImmutableMap, as suggested by the name, is a type of Map which is immutable. It means that the content of the map are fixed or constant after declaration, that is, they are read-only.
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@traversymedia Yes,I agree the most important thing is problem solving skill, that's why I have launched a youtube channel for this purpose check it out:
https://t.co/fTuZWo25GS
Don't feel stupid for having to Google the same stuff over and over. As long as you know how to find the answers, you're good.
As a programmer, your job is to find solutions, and using resources and tools is a huge part of that