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Don't use special naming conventions (e.g. uppercase for constants, $ for observables, _ for private members), except capitalization to distinguish a type (class, interface, type alias, enum) from a value of that type, which is the equivalent of using definite and indefinite articles in actual English. React components are an exception to this because of limitations of JSX syntax.
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Write acronyms in camel case:
getUrl
, notgetURL
.