Back in the days of JSPerf, the object literal lookup was always faster. The difference grows larger as you add more lines of "if" checks.
It's also a helpful & popular pattern to declare your string constants in an all-caps "constant" name (so const passwords would be const PASSWORDS) to consolidate (as opposed to mixing them throughout lines of an if/else statement) and make them easily recognizable. Then the lookup would read PASSWORDS[password.toLowerCase()]. Definitely not a "rule", but helpful to the reader.
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Back in the days of JSPerf, the object literal lookup was always faster. The difference grows larger as you add more lines of "if" checks.
It's also a helpful & popular pattern to declare your string constants in an all-caps "constant" name (so
const passwordswould beconst PASSWORDS) to consolidate (as opposed to mixing them throughout lines of an if/else statement) and make them easily recognizable. Then the lookup would readPASSWORDS[password.toLowerCase()]. Definitely not a "rule", but helpful to the reader.