I am getting a warning saying my constant is unused:
Initialization of immutable value 'myConst' was never used; consider replacing with assignment to '_' or removing it
if someVal["value"] != nil {
let myConst = someVal["value"]
}
So what will renaming let myConst = someVal["value"] into _ myConst = someVal["value"] do/mean?
You're not replacing let with _, but you're replacing the variable name with it. If the variable isn't used anywhere in the code it's irrelevant so the line can be written like:
_ = someVal["value"]
If you want to use it somewhere you need a name for it to reference it later on. But when you don't use it writing _ is a lot easier ...
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